1 files changed, 6 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index f4bbad3..07ebf77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -87,9 +87,14 @@ case ${host_os} in
 esac
 AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
 
-AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith -Wwrite-strings -Wswitch-default -Wno-unused-parameter")
+AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fvisibility=hidden")
 AC_SUBST(GLOBAL_CFLAGS)
 
+case "$GLOBAL_CFLAGS" in
+        *-fvisibility=hidden*)
+                AC_DEFINE([HAVE_FVISIBILITY], [1], [Define if compiled with -fvisibility=hidden])
+esac
+
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 AC_OUTPUT([