Use the same check for the ``ar'' program that lyskom-server uses.

src/libraries/liboop/configure.ac

@@ -7,6 +7,11 @@ dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_RANLIB
+AC_PATH_PROG([AR], [ar], [notfound], [$PATH$PATH_SEPARATOR/usr/ccs/bin])
+AC_ARG_VAR([AR], [ar program to use])
+[if test "$AR" = "notfound"; then]
+    AC_MSG_ERROR([cannot find ``ar''])
+[fi]
 
 AC_CHECK_HEADERS(poll.h sys/select.h sys/socket.h)