$OpenBSD: patch-configure_ac,v 1.2 2017/09/29 23:25:49 naddy Exp $

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -108,7 +108,7 @@ AC_ARG_ENABLE([Bsymbolic],
                 saved_LDFLAGS="${LDFLAGS}"
                 AC_MSG_CHECKING([for -Bsymbolic-functions linker flag])
                 LDFLAGS=-Wl,-Bsymbolic-functions
-                AC_TRY_LINK([], [int main (void) { return 0; }],
+                AC_TRY_LINK([], [],
                             [
                               AC_MSG_RESULT([yes])
                               enable_Bsymbolic=yes
@@ -140,7 +140,7 @@ case "$host" in
     SAVED_CFLAGS="${CFLAGS}"
     CFLAGS="-fvisibility=hidden"
     AC_MSG_CHECKING([for -fvisibility=hidden compiler flag])
-    AC_TRY_COMPILE([], [int main (void) { return 0; }],
+    AC_TRY_COMPILE([], [],
                    AC_MSG_RESULT(yes)
                    enable_fvisibility_hidden=yes,
                    AC_MSG_RESULT(no)
