configure.ac: Link `-lgc' when searching for `GC_mumble' functions.

Otherwise we can't find them and fall back to using deprecated things.
This is a shame.

diff --git a/configure.ac b/configure.ac
index 79778fddd4d45a6c367b546e2b5569619f046bae..0778fc98958c6770a4f92465f8374fa0eac08b68 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -475,7 +475,10 @@ LIBS=$mdw_SAVE_LIBS
 # and report them all at once.
 AC_CHECK_LIB(gc, GC_malloc,            [AC_SUBST(LIBGC,[-lgc])],
             [missing_libraries="$missing_libraries libgc"])
+mdw_SAVE_LIBS=$LIBS
+LIBS="$LIBS $LIBGC"
 AC_CHECK_FUNCS(GC_get_all_interior_pointers)
+LIBS=$mdw_SAVE_LIBS
 AC_CHECK_LIB(gcrypt, gcry_md_open,
              [AC_SUBST(LIBGCRYPT,[-lgcrypt])],
             [missing_libraries="$missing_libraries libgcrypt"])