AM_CONDITIONAL([BUILD_LIB_TESTPOINT], [test x$build_lib_testpoint = xyes])
AM_CONDITIONAL([BUILD_LIB_UST_CONSUMER], [test x$build_lib_ust_consumer = xyes])
-AM_CFLAGS="$OPT_CFLAGS $WARN_CFLAGS $PTHREAD_CFLAGS"
+AM_CFLAGS="-fvisibility=hidden $OPT_CFLAGS $WARN_CFLAGS $PTHREAD_CFLAGS"
AC_SUBST(AM_CFLAGS)
-AM_CXXFLAGS="$OPT_CXXFLAGS $WARN_CXXFLAGS $PTHREAD_CFLAGS"
+AM_CXXFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden $OPT_CXXFLAGS $WARN_CXXFLAGS $PTHREAD_CFLAGS"
AC_SUBST(AM_CXXFLAGS)
# This is set even though it is empty, so Makefiles can do "AM_LDFLAGS += ...".