configure.ac 30.1 KB
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dnl Process this file with autoconf to produce a configure script.
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dnl Note that version string is included in the handshake message, and
dnl must therefore not contain any space.
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AC_INIT([lsh], [2.9.1-exp], [bug-lsh@gnu.org]) 
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AC_PREREQ(2.52)
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AC_CONFIG_SRCDIR([src/lsh.c])
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# Needed to stop autoconf from looking for files in parent directories.
AC_CONFIG_AUX_DIR([.])
	
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AC_CONFIG_HEADER(src/config.h)
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# GNU libc defaults to supplying the ISO C library functions only. 
# initgroups() and strsignal() are extensions; the _GNU_SOURCE define
# enables these extensions.
# Enable it on all systems; no problems have been reported with it so far.
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AC_GNU_SOURCE
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# Check options
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AC_ARG_ENABLE(debug_alloc,
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  AC_HELP_STRING([--enable-debug-alloc], [Enable memory allocation sanity checks]),,
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  [enable_debug_alloc=no])
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AH_TEMPLATE([DEBUG_ALLOC],
	    [Define to enable sanity checking on memory allocation and casting])
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if test x$enable_debug_alloc = xyes ; then
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  AC_DEFINE(DEBUG_ALLOC)
fi

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AC_ARG_ENABLE(debug_trace,
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  AC_HELP_STRING([--enable-debug-trace], [Enable tracing support]),,
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  [enable_debug_trace=no])
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AH_TEMPLATE([DEBUG_TRACE], [Define to enable tracing])
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if test x$enable_debug_trace = xyes ; then
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  AC_DEFINE(DEBUG_TRACE)
fi

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AC_ARG_ENABLE(gcov,
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  AC_HELP_STRING([--enable-gcov], [Instrument for gcov (requires a modern gcc)]),,
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  [enable_gcov=no])

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AC_ARG_ENABLE(profiling,
  AC_HELP_STRING([--enable-profiling], [Instrument for gprof profiling]),,
  [enable_profiling=no])

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# FIXME: Not supported at the moment.
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with_zlib=no
# AC_ARG_WITH(zlib,
#   AC_HELP_STRING([--without-zlib], [Don't use zlib compression]),,
#   [with_zlib=yes])
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AC_ARG_WITH(tcpwrappers,
  AC_HELP_STRING([--with-tcpwrappers], 
                [Use tcp-wrappers for filtering connections]),
  [if test -z "$withval"; then 
    with_tcpwrappers=yes; 
  else 
    with_tcpwrappers="$withval";
  fi],
  [with_tcpwrappers=no])

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# Checking this variable is delayed until we have checked if zlib is
# actually available.
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AC_ARG_ENABLE(pty,
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  AC_HELP_STRING([--without-pty], [Disable pty support]),,
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  [enable_pty=yes])
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AH_TEMPLATE([WITH_PTY_SUPPORT], [Define to enable pty support])
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if test x$enable_pty = xyes ; then
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  AC_DEFINE(WITH_PTY_SUPPORT)
fi

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AC_ARG_ENABLE(srp,
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  AC_HELP_STRING([--disable-srp], [Disable the (experimental) support for SRP]),,
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  [enable_srp=yes])

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AC_ARG_ENABLE(gss,
  AC_HELP_STRING([--disable-gss], [Disable the (experimental) support for GSS]),,
  [enable_gss=yes])

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AC_ARG_ENABLE(kerberos,
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  AC_HELP_STRING([--disable-kerberos], [Don't support kerberos]),,
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  [enable_kerberos=yes])
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AC_ARG_ENABLE(pam,
  AC_HELP_STRING([--disable-pam], [Don't support PAM]),,
  [enable_pam=yes])

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AH_TEMPLATE([WITH_SRP], [Define if SRP should be supported])
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if test x$enable_srp = xyes ; then
  AC_DEFINE(WITH_SRP)
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  SRP_PROGRAM=srp-gen
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fi

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AC_SUBST(SRP_PROGRAM)

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AC_ARG_ENABLE(initgroups_workaround,
  AC_HELP_STRING([--enable-initgroups-workaround],
		 [Use a special initgroups for supporting more groups]),,
  [enable_initgroups_workaround=no])

AH_TEMPLATE([INITGROUPS_WORKAROUND],
	    [Define to enable the initgroups workaround])
if test x$enable_initgroups_workaround = xyes ; then
  AC_DEFINE(INITGROUPS_WORKAROUND)
fi


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AC_ARG_ENABLE(tcp_forward,
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  AC_HELP_STRING([--disable-tcp-forward], [Disable tcp forwarding]),,
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  [enable_tcp_forward=yes])
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AH_TEMPLATE([WITH_TCP_FORWARD], [Define to enable tcp forwarding])
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if test x$enable_tcp_forward = xyes ; then
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  AC_DEFINE(WITH_TCP_FORWARD)
fi
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AC_ARG_ENABLE(x11_forward,
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  AC_HELP_STRING([--disable-x11-forward], [Disable x11 forwarding (proxy only)]),,
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  [enable_x11_forward=yes])
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AH_TEMPLATE([WITH_X11_FORWARD], [Define to enable x11 forwarding])
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if test x$enable_x11_forward = xyes ; then
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  AC_DEFINE(WITH_X11_FORWARD)
fi

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AC_ARG_ENABLE(agent_forward,
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  AC_HELP_STRING([--disable-agent-forward], [Disable auth-agent forwarding (proxy only)]),,
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  [with_agent_forward=yes])

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AH_TEMPLATE([WITH_AGENT_FORWARD],
	    [Define to enable authentication agent forwarding])
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if test x$disable_agent_forward = xyes ; then
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  AC_DEFINE(WITH_AGENT_FORWARD)
fi

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AC_ARG_WITH(scheme,
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  AC_HELP_STRING([[--with-scheme[=PROGRAM]]], [Use a particular scheme implementation]),,
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  [with_scheme=])
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AC_ARG_WITH(system-argp,
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  AC_HELP_STRING([--with-system-argp], [Use the argp parser in libc]),,
  [with_system_argp=no])
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AC_ARG_WITH(system-nettle,
  AC_HELP_STRING([--with-system-nettle], [Use the installed nettle library]),,
  [with_system_nettle=no])

AC_ARG_WITH(system-libspki,
  AC_HELP_STRING([--with-system-libspki], [Use the installed spki library]),,
  [with_system_libspki=no])

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# IPv6 support
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AC_ARG_ENABLE(ipv6,
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  AC_HELP_STRING([--disable-ipv6], [Disable IPv6 support]),,
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  [enable_ipv6=yes])

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# utmp/wtmp logging 
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AC_ARG_ENABLE(utmp,
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  AC_HELP_STRING([--disable-utmp], [Disable utmp and wtmp support]),,
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  [enable_utmp=yes])

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AC_ARG_WITH(include-path,
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  AC_HELP_STRING([--with-include-path], [A colon-separated list of directories to search for include files]),,
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  [with_include_path=''])

if test x$with_include_path != x ; then
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  CPPFLAGS="$CPPFLAGS -I`echo $with_include_path | sed 's/:/ -I/g'`"
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fi

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AC_ARG_WITH(lib-path,
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  AC_HELP_STRING([--with-lib-path], [A colon-separated list of directories to search for libraries]),,
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  [with_lib_path=''])

if test x$with_lib_path != x ; then
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  LDFLAGS="$LDFLAGS -L`echo $with_lib_path | sed 's/:/ -L/g'`"
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fi

LSH_RPATH_INIT([`echo $with_lib_path | sed 's/:/ /g'` \
    `echo $exec_prefix | sed "s@^NONE@$prefix/lib@g" | sed "s@^NONE@$ac_default_prefix/lib@g"` \
    /usr/local/lib /sw/local/lib /sw/lib \
    /usr/gnu/lib /opt/gnu/lib /sw/gnu/lib /usr/freeware/lib /usr/pkg/lib])

dnl echo RPATH_CANDIDATE_DIRS = $RPATH_CANDIDATE_DIRS

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# Checks for programs.
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AC_PROG_CC
AC_PROG_MAKE_SET
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AC_PROG_RANLIB
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if test "x$am_cv_prog_cc_stdc" = xno ; then
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  AC_MSG_ERROR([the C compiler doesn't handle ANSI-C])
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fi

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AC_PROG_INSTALL

# According to the autoconf manual, needs install-sh from
# autoconf-2.60 or automake-1.10 to avoid races.
AC_PROG_MKDIR_P

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LSH_DEPENDENCY_TRACKING

if test x$enable_dependency_tracking = xyes ; then
  # Since the makefiles use include to get the dependency files, we must
  # make sure that the files exist.

  AC_CONFIG_COMMANDS([dummy-dep-files],
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  [(cd "$srcdir/src" && echo *.c testsuite/*.c) \
 | tr ' ' '\n' |sed 's/\.c$//' \
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 | (cd src && while read f; do echo > "$f.o.d"; done \
           && for f in format lsh_string parse werror; do echo > "$f.mo.d"; done)
])
fi

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# Use a particular scheme implementation?
if test x$with_scheme != x ; then
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  # If an absolute path is given, don't AC_PATH_PROG but just use it
  if grep "^/" > /dev/null <<EOF
$with_scheme 
EOF  
  then
    SCHEME_PROGRAM="$with_scheme" 
  else
    AC_PATH_PROG(SCHEME_PROGRAM, $with_scheme,, $PATH)
  fi
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else  
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  AC_PATH_PROGS(SCHEME_PROGRAM, guile scsh,, $PATH)
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fi
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if test "x$SCHEME_PROGRAM" = x ; then
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  AC_MSG_WARN([No scheme implementation found.
This is fine as long as you don't modify the source files.])
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  SCHEME_PROGRAM=false
fi

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SCHEME_NAME=`basename $SCHEME_PROGRAM`
AC_SUBST(SCHEME_NAME)

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if test "x$GROFF" = x; then
  AC_PATH_PROG(GROFF, groff,, $PATH)
fi
AC_ARG_VAR(GROFF, groff)

if test "x$M4" = x; then
  AC_PATH_PROG(M4, m4, m4)
fi
AC_ARG_VAR(M4, M4 macro processor)

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# Checks for header files.
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AC_HEADER_STDC
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# We don't look in gmp2 anymore, as we need gmp-3.1 or better.
AC_CHECK_HEADERS(gmp.h,,
  AC_MSG_ERROR([gmp.h not found]))
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AC_CHECK_HEADERS(fcntl.h strings.h sys/time.h unistd.h)
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AC_CHECK_HEADERS(shadow.h)
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if test x$with_zlib = xyes; then
  AC_CHECK_HEADERS(zlib.h,, [with_zlib=no])
fi
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AC_CHECK_HEADERS(libutil.h)
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AC_CHECK_HEADERS(crypt.h)
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AC_CHECK_HEADERS(pty.h)
AC_CHECK_HEADERS(stropts.h)
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AC_CHECK_HEADERS(syslog.h)
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AC_CHECK_HEADERS(argp.h)
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AC_CHECK_HEADERS(sys/resource.h)
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AC_CHECK_HEADERS(sys/filio.h)
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AC_CHECK_HEADERS(ucred.h)
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AC_CHECK_HEADERS(utmp.h, [have_utmp_h=yes], [have_utmp_h=no])
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AC_CHECK_HEADERS(utmpx.h, [have_utmpx_h=yes], [have_utmpx_h=no])
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dnl With current autoconfs we can't check for struct ut_tv with
dnl AC_CHECK_MEMBERS, but we can check for sub members. Leave the
dnl ut_tv check for clarity.

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if test x$have_utmp_h = xyes; then
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  # Currently, no support for pure bsd systems where login(3) and
  # friends are the only library functions for updating the utmp and
  # wtmp data. FIXME: Don't do this if we're going to use the the utmpx
  # functions instead.
  AC_CHECK_FUNC([pututline],,[enable_utmp=no])
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  AC_CHECK_MEMBERS([struct utmp.ut_host,
		    struct utmp.ut_name,
		    struct utmp.ut_user,
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		    struct utmp.ut_time,
		    struct utmp.ut_tv,
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		    struct utmp.ut_tv.tv_sec,
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		    struct utmp.ut_id,
		    struct utmp.ut_syslen,
		    struct utmp.ut_session,
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		    struct utmp.ut_pid,
		    struct utmp.ut_exit,
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		    struct utmp.ut_exit.e_termination,
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		    struct utmp.ut_exit.__e_termination,
		    struct utmp.ut_exit.ut_termination,
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		    struct utmp.ut_addr,
		    struct utmp.ut_addr_v6],,,
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[# if HAVE_SYS_TYPES_H
#  include <sys/types.h>
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# endif
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# if HAVE_UTMP_H
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#  include <utmp.h>
# endif
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])
fi
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if test x$have_utmpx_h = xyes; then
  AC_CHECK_MEMBERS([struct utmpx.ut_host,
		    struct utmpx.ut_name,
		    struct utmpx.ut_user,
		    struct utmpx.ut_time,
		    struct utmpx.ut_id,
		    struct utmpx.ut_tv,
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		    struct utmpx.ut_tv.tv_sec,
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		    struct utmpx.ut_syslen,
		    struct utmpx.ut_session,
		    struct utmpx.ut_pid,
		    struct utmpx.ut_exit,
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		    struct utmpx.ut_exit.e_termination,
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		    struct utmpx.ut_exit.__e_termination,
		    struct utmpx.ut_exit.ut_termination,
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		    struct utmpx.ut_addr,
		    struct utmpx.ut_addr_v6],,,
[# if HAVE_UTMPX_H
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#  include <utmpx.h>
# endif
])
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fi
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AH_TEMPLATE([WITH_UTMP], [For utmp support])
if test x$enable_utmp = xyes ; then
  AC_DEFINE(WITH_UTMP)
fi

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AH_TEMPLATE([WITH_GSS_K5], [Whether to use gss K5 authorization (Heimdal/MIT)])
if test x$enable_gss != xno; then
  if test x$enable_gss = xk5; then
    AC_CHECK_PROG(KRB5CONFIG, krb5-config, krb5-config, no)
    if test x$KRB5CONFIG != xno; then
      CPPFLAGS="$CPPFLAGS `$KRB5CONFIG --cflags gssapi`"
      LIBS="$LIBS `$KRB5CONFIG --libs gssapi`"
      AC_CHECK_HEADERS([gssapi.h gssapi/gssapi.h gssapi/gssapi_generic.h])
      AC_DEFINE(WITH_GSS_K5)
      AC_CHECK_DECL(GSS_C_NT_HOSTBASED_SERVICE,, [
	AC_DEFINE(GSS_C_NT_HOSTBASED_SERVICE,
		gss_nt_service_name,
		[Work around buggy MIT library])], [
#ifdef HAVE_GSSAPI_H
#include <gssapi.h>
#endif
#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
#endif
#ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H
#include <gssapi/gssapi_generic.h>
#endif
])
    fi
  else
    AC_CHECK_HEADERS(gss.h,, [enable_gss=no])
    AC_CHECK_LIB(gss, gss_check_version,, [enable_gss=no])
  fi
fi
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if test x$enable_kerberos = xyes; then
  AC_CHECK_HEADERS(krb5.h,, [enable_kerberos=no])
fi

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if test x$enable_pam = xyes; then
  AC_CHECK_HEADERS(security/pam_appl.h,, [enable_pam=no])
fi

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# Some systems (in particular, Unixware) doesn't have socklen_t, but
# uses size_t. Falling back to int will cause some warnings.
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# AC_CHECK_TYPE doesn't work, probably because the type in
# question is not defined in sys/types.h.
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LSH_TYPE_SOCKLEN_T
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# Checks for libraries

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# System libraries first. E.g., X11 libraries depend on gethostbyname,
# which on Solaris is in nsl.

# glibc has a nis-library "libnsl", which we don't need. So use
# AC_SEARCH_LIBS rather than AC_CHECK_LIB.
AC_SEARCH_LIBS(gethostbyname, nsl)
AC_SEARCH_LIBS(inet_ntop, nsl)
AC_CHECK_LIB(socket, setsockopt)

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AC_CHECK_LIB(gmp, __gmpz_getlimbn,,
    [AC_MSG_ERROR(
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    [GNU MP not found, or not 3.1 or up, see http://gmplib.org/.])])
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LSH_RPATH_FIX

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AC_CHECK_LIB([oop], [oop_sys_new],,
  [AC_MSG_ERROR([liboop is missing. Get liboop from http://www.liboop.org])])

LSH_RPATH_FIX

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if test x$with_zlib = xyes; then
  AC_CHECK_LIB(z, inflate,, [with_zlib=no])
fi

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if test x$with_zlib = xyes; then
  LSH_RPATH_FIX
fi

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# FIXME: Should we let people use --with-tcpwrappers=/here/they/are?

if test x$with_tcpwrappers = xyes; then
  AC_CHECK_LIB(wrap, request_init,, 
  [
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      AC_MSG_WARN([Failed to link libwrap, you might try adding -lsocket to LDFLAGS])
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      with_tcpwrappers=no
  ])

  AC_CHECK_HEADER(tcpd.h,, [with_tcpwrappers=no])

  if test x$with_tcpwrappers = xno; then
    AC_MSG_WARN([Failed to find a working tcpwrappers setup, disabling wrappers])
  fi
fi

if test x$with_tcpwrappers = xyes; then
  LSH_RPATH_FIX
  AC_DEFINE(WITH_TCPWRAPPERS,1,[Whatever to use tcpwrappers])
else
  AC_DEFINE(WITH_TCPWRAPPERS,0,[Whatever to use tcpwrappers])
fi


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# X11 stuff. We only need Xauth, usually located in libXau.
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# FIXME: Use AC_PATH_XTRA instead?

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AC_PATH_X

if test -z "$no_x" ; then
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  if test -n "$x_includes" ; then
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    CPPFLAGS="$CPPFLAGS -I$x_includes"
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  fi
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  if test -n "$x_libraries" ; then
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    # Kludge for On Solaris-5.8, AC_PATH_X seems to pick up headers
    # and libraries i /usr/include and /usr/lib, which doesn't work
    # because /usr/lib contains symlinks to most libraries, but not
    # for libXau which is the one we need.
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    if test "x$x_libraries" = xNONE; then
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      if test -f /usr/openwin/lib/libXau.so ; then
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        AC_MSG_WARN([Using X11 libraries in /usr/openwin/lib.])
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        x_libraries=/usr/openwin/lib
      fi
    fi
    
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    LDFLAGS="$LDFLAGS -L$x_libraries"
    LSH_RPATH_ADD($x_libraries)
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  fi
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fi

AC_CHECK_HEADERS(X11/Xauth.h)
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AC_SEARCH_LIBS(XauGetAuthByAddr, Xau)
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LSH_RPATH_FIX

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AC_CHECK_LIB(crypt, crypt)
AC_CHECK_LIB(xnet, inet_addr)
# logwtmp is also in libutil
AC_CHECK_LIB(util, openpty)
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# This macro is new in autoconf-2.13
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AC_SEARCH_LIBS(syslog, bsd socket inet, [AC_DEFINE(HAVE_SYSLOG)])
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AH_TEMPLATE([WITH_ZLIB], [Define if zlib should be used])
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# Should we use zlib?
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if test x$with_zlib = xyes ; then
  AC_DEFINE(WITH_ZLIB)
fi

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AH_TEMPLATE([WITH_GSS], [Define if gss should be used])
# Should we use gss?
if test x$enable_gss != xno ; then
  AC_DEFINE(WITH_GSS)
fi

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# The kerberos libraries are needed only to support the
# krb-check-passwd program, so we put them $KRB_LIBS, not in the
# ordinary $LIBS.

if test x$enable_kerberos = xyes; then
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  LSH_CHECK_KRB_LIB(roken, strlcpy)
  LSH_CHECK_KRB_LIB(resolv, dn_expand)
  LSH_CHECK_KRB_LIB(des, des_cbc_encrypt)
  LSH_CHECK_KRB_LIB(asn1, der_get_octet_string)
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  # Check for krb5_cc_gen_new too?
  # krb5_verify_user_lrealm seems to be unique to heimdal
  LSH_CHECK_KRB_LIB(krb5, krb5_verify_user_lrealm,, [enable_kerberos=no])
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fi

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AH_TEMPLATE([WITH_KERBEROS], [For kerberos])
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if test x$enable_kerberos = xyes; then
  AC_DEFINE(WITH_KERBEROS)
  KRB_PROGRAM=lsh-krb-checkpw
fi

AC_SUBST(KRB_LIBS)
AC_SUBST(KRB_PROGRAM)

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AH_TEMPLATE([WITH_PAM], [For PAM])
if test x$enable_pam = xyes; then
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  AC_CHECK_LIB(pam,pam_start,, enable_pam=no )

  if test x$enable_pam = xyes; then
    AC_DEFINE(WITH_PAM)
    PAM_PROGRAM=lsh-pam-checkpw
  else
    AC_MSG_WARN([pam_start not found in libpam, disabling PAM])
  fi
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fi

AC_SUBST(PAM_PROGRAM)

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AH_TEMPLATE([WITH_GCOV], [Use gcov])
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if test "x$enable_gcov" = "xyes"; then
  CFLAGS="$CFLAGS -ftest-coverage -fprofile-arcs"
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  AC_DEFINE(WITH_GCOV)
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fi

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if test "x$enable_profiling" = "xyes"; then
  CFLAGS="$CFLAGS -pg"
fi

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# Checks for typedefs, structures, and compiler characteristics.
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AC_C_CONST
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AC_C_INLINE
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AC_TYPE_UID_T
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AC_TYPE_SIZE_T
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AC_HEADER_TIME

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# Needed by the supplied memcmp.c
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AC_C_BIGENDIAN

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# FIXME: We should check that a pid_t fits in an int
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# Checks for library functions.
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LSH_FUNC_ALLOCA
LSH_FUNC_STRERROR
LSH_FUNC_STRSIGNAL
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AC_FUNC_MEMCMP
AC_FUNC_VPRINTF
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AC_CHECK_FUNCS(select socket strtol alarm)
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AC_CHECK_FUNCS(getrusage gettimeofday)
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AC_CHECK_FUNCS(getspnam)
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AC_CHECK_FUNCS(vsnprintf inet_aton inet_ntop)
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AC_CHECK_FUNCS(openpty)
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AC_CHECK_FUNCS(logwtmp login logout pututline pututxline updwtmp updwtmpx)
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AC_CHECK_FUNCS(getaddrinfo getnameinfo gai_strerror)
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AC_CHECK_FUNCS(setrlimit getdtablesize)
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AC_FUNC_GETPGRP
AC_CHECK_FUNCS(syslog)
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# HP-UX doesn't have seteuid
AC_CHECK_FUNCS(seteuid setresuid)

AH_BOTTOM(
[#if !HAVE_SETEUID
# if HAVE_SETRESUID
#  define seteuid(uid) setresuid(-1, (uid), -1)
# endif
#endif])

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# FIXME: Is there a better way in autoconf 2.50?
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AC_CACHE_CHECK([if netdb.h defines AI_NUMERICHOST],
  lsh_cv_sys_ai_numerichost,
  [AC_EGREP_CPP(yes,
    [#include <netdb.h>
     #ifdef AI_NUMERICHOST
     yes
     #endif
    ], lsh_cv_sys_ai_numerichost=yes,
       lsh_cv_sys_ai_numerichost=no)])
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AH_TEMPLATE([HAVE_AI_NUMERICHOST], [Define if AI_NUMERICHOST exists])
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if test x$lsh_cv_sys_ai_numerichost = xyes ; then
  AC_DEFINE(HAVE_AI_NUMERICHOST)
fi

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# Test if the libc includes a good enough argp.
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# FIXME: Doesn't check for the argp-help bug.
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if test x$with_system_argp = xyes ; then
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  LSH_LIB_ARGP(,with_system_argp=no)
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fi

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BUILD_SUBDIRS=''
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LIB_ARGP=''
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if test x$with_system_argp = xno ; then
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  AC_CONFIG_COMMANDS([argp-symlinks],
  [argp_srcdir="`cd "$srcdir/argp" && pwd`"
  (cd src && rm -f argp argp_builddir && ln -s ../argp argp_builddir && ln -s $argp_srcdir argp)
  ])
  BUILD_SUBDIRS="$BUILD_SUBDIRS argp"
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  LIB_ARGP="-largp"
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fi
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if test x$with_system_nettle = xno ; then
  AC_CONFIG_COMMANDS([nettle-symlinks],
  [nettle_srcdir="`cd "$srcdir/nettle" && pwd`"
  for d in spki src ; do
    (mkdir $d 2>/dev/null; cd $d && rm -f nettle nettle_builddir && ln -s ../nettle nettle_builddir && ln -s $nettle_srcdir nettle)
  done])
  BUILD_SUBDIRS="$BUILD_SUBDIRS nettle"
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fi
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if test x$with_system_libspki = xno ; then
  AC_CONFIG_COMMANDS([libspki-symlinks],
  [spki_srcdir="`cd "$srcdir/spki" && pwd`"
  (cd src && rm -f spki spki_builddir && ln -s ../spki spki_builddir && ln -s $spki_srcdir spki)
  ])
  BUILD_SUBDIRS="$BUILD_SUBDIRS spki"
fi

AC_SUBST(BUILD_SUBDIRS)
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AC_SUBST(LIB_ARGP)
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# Check for broken shutdown
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AC_CACHE_CHECK(for working shutdown on AF_UNIX sockets,
	       lsh_cv_func_shutdown_works_on_unix_sockets,
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[
AC_TRY_RUN([
#include <stdio.h>

#include <errno.h>

#include <sys/types.h>
#include <sys/socket.h>

#include <signal.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

/* Creates a one-way socket connection. Returns 1 on success, 0 on
 * failure. fds[0] is for reading, fds[1] for writing (like for the
 * pipe() system call). */
static int make_pipe(int *fds)
{

#ifndef SHUT_RD
#define SHUT_RD 0
#define SHUT_WR 1
#define SHUT_RDWR 2
#endif

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  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0)
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    {
      fprintf(stderr, "socketpair() failed: %s\n", strerror(errno));
      return 0;
    }
  fprintf(stderr, "Created socket pair. Using fd:s %d <-- %d\n", fds[0], fds[1]);

  if(shutdown(fds[0], SHUT_WR) < 0)
    {
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      fprintf(stderr, "shutdown(%d, SHUT_WR) failed: %s\n",
	      fds[0], strerror(errno));
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      return 0;
    }
  if (shutdown(fds[1], SHUT_RD) < 0)
    {
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      fprintf(stderr, "shutdown(%d, SHUT_RD) failed: %s\n",
	      fds[1], strerror(errno));
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      return 0;
    }

  return 1;
}

int main(int argc, char **argv)
{
  int fds[2];
  
  if (!make_pipe(fds))
    exit(1);

  if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
    {
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      fprintf(stderr, "signal failed.\n");
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      exit(1);
    }

  if ( (write(fds[1], "foo", 3) < 0)
       && (errno == EPIPE))
    exit(1);

  exit(0);
}
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], lsh_cv_func_shutdown_works_on_unix_sockets=yes,
   lsh_cv_func_shutdown_works_on_unix_sockets=no,
   lsh_cv_func_shutdown_works_on_unix_sockets=yes)])
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AH_TEMPLATE([SHUTDOWN_WORKS_WITH_UNIX_SOCKETS],
	    [Define to indicate that shutdown seems to work properly])
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if test x$lsh_cv_func_shutdown_works_on_unix_sockets = xyes ; then
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    AC_DEFINE(SHUTDOWN_WORKS_WITH_UNIX_SOCKETS)
fi

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AC_CACHE_CHECK(
  [for working UNIX98 ptys],
  lsh_cv_sys_unix98_ptys,
  AC_TRY_RUN([
  /* Try to obtain a working UNIX98-style pty master and slave */
  /* Based on example code from the GNU C library documentation */
  #include <stdlib.h>	/* EXIT_FAILURE, EXIT_SUCCESS, ptsname */
  #include <unistd.h>	/* close(2) */
  
  #include <sys/types.h>	/* open(2) */
  #include <sys/stat.h>	/* - " -   */
  #ifdef HAVE_FCNTL_H
  #  include <fcntl.h>	/* - " -   */
  #endif
  #ifdef HAVE_STROPTS_H
  #  include <stropts.h>	/* isastream() */
  #endif
  
  int main(int argc, char* argv[]) {
    int master, slave;
    char *name;
  
    master = open("/dev/ptmx", O_RDWR); /* PTY master multiplex */
    if (master < 0) {
  	  exit(EXIT_FAILURE);
    }
  
    if (grantpt(master) < 0 || unlockpt(master) < 0)
      goto close_master;
    name = ptsname(master);
    if (name == NULL)
      goto close_master;
  
    slave = open(name, O_RDWR);
    if (slave == -1)
      goto close_master;
  
  #ifdef HAVE_STROPTS_H
    if (isastream(slave))
      {
  	if (ioctl(slave, I_PUSH, "ptem") < 0
  	    || ioctl(slave, I_PUSH, "ldterm") < 0)
  	  goto close_slave;
      }
  #endif
  
    exit(0);
  
  close_slave:
    close (slave);
  
  close_master:
    close (master);
    exit(1);
  }
  ],
  [lsh_cv_sys_unix98_ptys=yes],
  [lsh_cv_sys_unix98_ptys=no],
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  # Pessimistic default for cross compilation.
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  [lsh_cv_sys_unix98_ptys=no]))

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AH_TEMPLATE([HAVE_UNIX98_PTYS],
	    [Define if a we have working UNIX98 pty handling])
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if test x$lsh_cv_sys_unix98_ptys = xyes; then
  AC_DEFINE(HAVE_UNIX98_PTYS)
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else
  AC_MSG_WARN([No support for UNIX98 PTYs. PTY support disabled.])
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fi
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# Check that FIONREAD exists, works, and uses an argument of type int, not long.  
AC_CACHE_CHECK(
  [for FIONREAD with int argument],
  lsh_cv_sys_ioctl_fionread_int,
[AC_TRY_RUN([
#include <errno.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#if HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
int main(int argc, char **argv)
{
#ifdef FIONREAD
  union {
    int i[2];
    long l;
  } val;

  int fds[2];
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  int res;
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  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0)
    {
      printf("socketpair failed: errno = %d.\n", errno);
      return 1;
    }
    
  val.i[0] = 0xdeadbeaf;
  val.i[1] = 0xdeadbeaf;

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  do 
    res = write(fds[1], "xxx", 3);
  while (res < 0 && errno == EINTR);

  if (res != 3)
    {
      printf("write failed: errno = %d.\n", errno);
      return 1;
    }
  
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  if (ioctl(fds[0], FIONREAD, val.i) < 0)
    {
      printf("ioctl FIONREAD failed: errno = %d.\n", errno);
      return 1;
    }
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  if (val.i[0] == 3 && val.i[1] == 0xdeadbeaf)
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    return 0;
#endif
  return 1;
}
], lsh_cv_sys_ioctl_fionread_int=yes,
   lsh_cv_sys_ioctl_fionread_int=no,
   lsh_cv_sys_ioctl_fionread_int=no)])

AH_TEMPLATE([HAVE_IOCTL_FIONREAD],
	    [Define if the FIONREAD ioctl works, and uses an argument of type int])
if test x$lsh_cv_sys_ioctl_fionread_int = xyes; then
  AC_DEFINE([HAVE_IOCTL_FIONREAD])
fi

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# Check that credentials passing work
AC_CACHE_CHECK(
  [for credentials passing],
  lsh_cv_sys_ucred_passing,
[AC_TRY_RUN([
/* For CMSG_SPACE and friends on Solaris */
#define _XPG4_2

#include <errno.h>
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>

/* Linux: For struct ucred */
#include <sys/types.h>
#include <sys/socket.h>

/* Solaris ucred support */
#if HAVE_UCRED_H
#include <ucred.h>
#endif

int main (int argc, char **argv)
{
  int pipe[2];
  int type;
  struct msghdr hdr;
  struct cmsghdr *cmsg;
  struct iovec io;
  void *creds_buf;
  size_t creds_size;
  size_t creds_space;
  char buf[3];
  int res;
  int yes = 1;

#ifdef SO_RECVUCRED
  /* Solaris' ucred passing works with SOCK_DGRAM sockets only */
  type = SOCK_DGRAM;
#else
  type = SOCK_STREAM;
#endif
  if (socketpair(AF_UNIX, type, 0, pipe) < 0)
    {
      printf("socketpair failed: errno = %d.\n", errno);
      return 1;
    }

#if defined (SO_PASSCRED)
  /* For Linux */
  if (setsockopt(pipe[1], SOL_SOCKET, SO_PASSCRED,
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		 &yes, sizeof(yes)) < 0)
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    {
      printf("setsockopt SO_PASSCRED failed: %d.\n", errno);
      return 1;
    }
#elif defined (SO_RECVUCRED)
  /* Solaris */
  if (setsockopt(pipe[1], SOL_SOCKET, SO_RECVUCRED,
  		   &yes, sizeof(yes)) < 0)
    {
      printf("setsockopt SO_RECVUCRED failed: %d.\n", errno);
      return 1;
    }
#endif

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#if defined (SCM_CREDENTIALS)
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  creds_size = sizeof(struct ucred);
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#elif defined (SCM_CREDS)
  creds_size = sizeof(struct cmsgcred);
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#else
  creds_size = 0;
#endif

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  /* Appearantly, on FreeBSD-6.3, sendmsg requires that if
     msg_controllen == 0, then one *must* also have msg_control == NULL. */
  
  if (creds_size)
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    {
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      creds_space = CMSG_SPACE(creds_size);
      creds_buf = malloc(creds_space);
      if (!creds_buf)
	{
	  printf("malloc failed\n");
	  return 1;
	}
    }
  else
    {
      creds_space = 0;
      creds_buf = NULL;
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    }

  io.iov_base = (void *) "foo";
  io.iov_len = 3;
  
  hdr.msg_name = NULL;
  hdr.msg_namelen = 0;
  hdr.msg_iov = &io;
  hdr.msg_iovlen = 1;
  hdr.msg_controllen = creds_space;
  hdr.msg_control = creds_buf;

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#if defined (SCM_CREDENTIALS)
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  /* Linux style credentials */
  
  {
    struct ucred *creds;

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    cmsg = CMSG_FIRSTHDR(&hdr);
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    cmsg->cmsg_level = SOL_SOCKET;
    cmsg->cmsg_type = SCM_CREDENTIALS;
    cmsg->cmsg_len = CMSG_LEN(sizeof(*creds));

    creds = (struct ucred *) CMSG_DATA(cmsg);
    creds->pid = getpid();
    creds->uid = getuid();
    creds->gid = getgid();

    hdr.msg_controllen = CMSG_SPACE(sizeof(*creds));
  }
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#elif defined (SCM_CREDS)
  {
    cmsg = CMSG_FIRSTHDR(&hdr);

    cmsg->cmsg_level = SOL_SOCKET;
    cmsg->cmsg_type = SCM_CREDS;
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));

    /* Data filled in by the kernel */
    hdr.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));      
  }
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#else
  hdr.msg_controllen = 0;
#endif 

  do
    res = sendmsg(pipe[0], &hdr, 0);
  while (res < 0 && errno == EINTR);

  if (res < 0)
    {
      printf("sendmsg failed: errno = %d.\n", errno);
      return 1;
    }
  
  memset(buf, 0, sizeof(buf));
  if (creds_space)
    memset(creds_buf, 0, creds_space);

  io.iov_base = (void *) buf;
  io.iov_len = sizeof(buf);

  hdr.msg_name = NULL;
  hdr.msg_namelen = 0;
  hdr.msg_iov = &io;
  hdr.msg_iovlen = 1;
  hdr.msg_controllen = creds_space;
  hdr.msg_control = creds_buf;
  
  do
    res = recvmsg(pipe[1], &hdr, 0);
  while (res < 0 && errno == EINTR);

  if (res < 0)
    {
      printf("recvmsg failed: errno = %d.\n", errno);
      return 1;
    }

  if (res != 3)
    {
      printf("recvmsg returned unexpected count\n");
      return 1;
    }

  if (memcmp (buf, "foo", 3) != 0)
    {
      printf("recvmsg returned unexpected data\n");
      return 1;
    }

  /* Process ancillary data */
  for (cmsg = CMSG_FIRSTHDR(&hdr); cmsg; cmsg = CMSG_NXTHDR(&hdr, cmsg))
    {
      pid_t pid;
      uid_t uid;
      gid_t gid;

      if (cmsg->cmsg_level != SOL_SOCKET)
	continue;
      switch (cmsg->cmsg_type)
	{
	  got_creds:
	    if (pid != getpid())
	      {
	        printf("Received unexpected pid %d\n", (int) pid);
		return 1;
	      }
	    if (uid != getuid())
	      {
	        printf("Received unexpected uid %d\n", (int) uid);
		return 1;
	      }
	    if (gid != getgid())
	      {
	        printf("Received unexpected gid %d\n", (int) gid);
		return 1;
	      }
	    /* Success! */
	    return 0;
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#if defined (SCM_CREDENTIALS)
	case SCM_CREDENTIALS:
	  {
	    struct ucred *creds;
	    if (cmsg->cmsg_len != CMSG_LEN(sizeof(*creds)))
	      continue;

	    creds = (struct ucred *) CMSG_DATA(cmsg);
	    pid = creds->pid;
	    uid = creds->uid;
	    gid = creds->gid;

	    goto got_creds;
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	  }
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#elif defined (SCM_CREDS)
	case SCM_CREDS:
	  {
	    struct cmsgcred *creds;
	    if (cmsg->cmsg_len != CMSG_LEN(sizeof(*creds)))
	      continue;

	    creds = (struct cmsgcred *) CMSG_DATA(cmsg);
	    pid = creds->cmcred_pid;
	    uid = creds->cmcred_uid;
	    gid = creds->cmcred_gid;

	    goto got_creds;
	  }	  
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#elif defined (SCM_UCRED)
	case SCM_UCRED:
	  {
	    ucred_t *creds;

	    creds = (ucred_t *) CMSG_DATA(cmsg);
	    pid = ucred_getpid(creds);
	    uid = ucred_geteuid(creds);
	    gid = ucred_getegid(creds);

	    goto got_creds;
	  }	    
#endif
	}
    }
  printf("No creds received.\n");
  return 1;
} 
], lsh_cv_sys_ucred_passing=yes,
   lsh_cv_sys_ucred_passing=no,
   lsh_cv_sys_ucred_passing=no)])

AH_TEMPLATE([HAVE_SOCKET_CREDENTIALS_PASSING],
	    [Define if credentials passing over unix sockets work])
if test x$lsh_cv_sys_ucred_passing = xyes; then
  AC_DEFINE([HAVE_SOCKET_CREDENTIALS_PASSING])
fi

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LSH_GCC_ATTRIBUTES
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AC_MSG_CHECKING(for BSD pty names)
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AH_TEMPLATE([PTY_BSD_SCHEME_FIRST_CHARS],
	    [Possible first characters in a /dev/ptyXX name])
AH_TEMPLATE([PTY_BSD_SCHEME_SECOND_CHARS],
	    [Possible second characters in a /dev/ptyXX name])

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# FIXME: What is most portable, tr -d '\n' or tr -d '\012' ?
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AC_DEFINE_UNQUOTED(PTY_BSD_SCHEME_FIRST_CHARS, "`ls /dev/pty* | cut -c 9-9 | uniq | tr -d '\n'`")
AC_DEFINE_UNQUOTED(PTY_BSD_SCHEME_SECOND_CHARS, "`ls /dev/pty* | cut -c 10-10 | sort | uniq | tr -d '\n'`")
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# FIXME: How can we test if the bsd scheme is likely to work?
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AH_TEMPLATE([PTY_BSD_SCHEME], [Traditional BSD pty handling])
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AC_DEFINE(PTY_BSD_SCHEME)
AC_MSG_RESULT([done])

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# IPv6 support
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if test x$enable_ipv6 = xyes ; then
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  if test x$ac_cv_func_getaddrinfo != xyes ; then
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    AC_MSG_WARN([getaddrinfo not found. Disabling IPv6 support])
    enable_ipv6=no
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  elif test x$ac_cv_func_gai_strerror != xyes ; then
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    AC_MSG_WARN([gai_strerror not found. Disabling IPv6 support])
    enable_ipv6=no
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  elif test x$lsh_cv_sys_ai_numerichost != xyes ; then
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    AC_MSG_WARN([AI_NUMERICHOST not defined. Disabling IPv6 support])
    enable_ipv6=no
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  fi
fi

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AH_TEMPLATE([WITH_IPV6], [For Ipv6 support])
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if test x$enable_ipv6 = xyes ; then
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  AC_DEFINE(WITH_IPV6)
fi

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# Unconditionally configure nettle; otherwise make dist won't work
AC_CONFIG_SUBDIRS(argp nettle spki)
# AC_CONFIG_SUBDIRS(src/sftp)
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# Set these flags *last*, or else the test programs won't compile
if test x$GCC = xyes ; then
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  # Using -ggdb3 makes (some versions of) Redhat's gcc-2.96 dump core
  if "$CC" --version | grep '^2\.96$' 1>/dev/null 2>&1; then
    true
  else
    CFLAGS="$CFLAGS -ggdb3"
  fi
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  # FIXME: It would be better to actually test if this option works and/or is needed.
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  # Or perhaps use -funsigned-char.
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  if "$CC" --version | grep 'gcc.* 4\.' 1>/dev/null 2>&1; then
    CFLAGS="$CFLAGS -Wno-pointer-sign"
  fi
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  CFLAGS="$CFLAGS -Wall -W \
  -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes \
  -Wpointer-arith -Wbad-function-cast -Wnested-externs"
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# Don't enable -Wcast-align as it results in tons of warnings in the
# DES code. And when using stdio.
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# Don't enable -Waggregate-return, as that causes warnings for glibc
# inttypes.h.
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fi
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# Used by contrib/solpkg.sh.in.
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AC_SUBST(BUILD_ARCH, `uname -p`)
AC_SUBST(BUILD_OSSYS,`uname -s`)
AC_SUBST(BUILD_OSREV,`uname -r`)

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# Should also generate rsync/Makefile and sftp

AC_CONFIG_FILES([Makefile src/config.make src/Makefile src/testsuite/Makefile
		 doc/Makefile misc/Makefile
		 contrib/Makefile contrib/lsh.spec contrib/solpkg.sh])
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AC_OUTPUT