Added version check of zlib.h.

Rev: src/modules/Gz/configure.in:1.4

src/modules/Gz/configure.in

@@ -6,6 +6,16 @@ sinclude(../module_configure.in)
 
 if test x$with_zlib = xyes ; then
   AC_CHECK_HEADERS(zlib.h)
+  if test $ac_cv_header_zlib_h = yes ; then
+    AC_MSG_CHECKING([if libz.h is new enough])
+    AC_TRY_LINK([
+#include <zlib.h>
+    ],[
+int main(int argc, char **argv)
+{
+  return((Z_NO_COMPRESSION|Z_VERSION_ERROR) & 0);
+}
+    ],[ AC_MSG_RESULT(yes) ],[ AC_MSG_RESULT(no); ac_cv_header_zlib_h=no ])
     if test $ac_cv_header_zlib_h = yes ; then
       AC_CHECK_LIB(z, compress, [
         AC_DEFINE(HAVE_LIBZ) 
@@ -14,6 +24,7 @@ if test x$with_zlib = xyes ; then
       AC_CHECK_LIB(gz, compress))
     fi
   fi
+fi
 
 AC_OUTPUT(Makefile,echo FOO >stamp-h )