configure: Build with -Wstrict-prototypes if supported.
diff --git a/aclocal.m4 b/aclocal.m4
index 90e166d..f7beb5d 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -75,7 +75,8 @@
AC_CACHE_CHECK([whether the compiler supports $1], ac_var,
[ac_wine_try_cflags_saved=$CFLAGS
CFLAGS="$CFLAGS $1"
-AC_LINK_IFELSE(AC_LANG_PROGRAM(), [AS_VAR_SET(ac_var,yes)], [AS_VAR_SET(ac_var,no)])
+AC_LINK_IFELSE(AC_LANG_SOURCE([int main(int argc, char *argv[]) { return 0; }]),
+ [AS_VAR_SET(ac_var,yes)], [AS_VAR_SET(ac_var,no)])
CFLAGS=$ac_wine_try_cflags_saved])
AS_IF([test AS_VAR_GET(ac_var) = yes],
[m4_default([$2], [EXTRACFLAGS="$EXTRACFLAGS $1"])], [$3])dnl
