1 files changed, 6 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index 6e3e058..0e335f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -188,9 +188,14 @@ else
         building_debug_code=yes
 fi
 
-AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith  -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fsigned-char")
+AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith  -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fsigned-char -fvisibility=hidden")
 AC_SUBST(GLOBAL_CFLAGS)
 
+case "$GLOBAL_CFLAGS" in
+  *-fvisibility=hidden*)
+    AC_DEFINE([HAVE_FVISIBILITY], [1], [Define if compiled with -fvisibility=hidden])
+esac
+
 # check for large file support
 AC_SYS_LARGEFILE
 LFS_CFLAGS=''