diff --git a/dev-libs/nspr/files/nspr-4.6.1-gcc-visibility.patch b/dev-libs/nspr/files/nspr-4.6.1-gcc-visibility.patch
new file mode 100644
--- /dev/null
+++ b/dev-libs/nspr/files/nspr-4.6.1-gcc-visibility.patch
@@ -0,0 +1,15 @@
+Index: mozilla/nsprpub/pr/include/prtypes.h
+diff -u mozilla/nsprpub/pr/include/prtypes.h:3.30 mozilla/nsprpub/pr/include/prtypes.h:3.30.2.1
+--- mozilla/nsprpub/pr/include/prtypes.h:3.30   Fri Apr 29 21:02:54 2005
++++ mozilla/nsprpub/pr/include/prtypes.h        Tue Jan  3 17:43:35 2006
+@@ -178,7 +178,9 @@
+
+ #else /* Unix */
+
+-#ifdef HAVE_VISIBILITY_PRAGMA
++/* GCC 3.3 and later support the visibility attribute. */
++#if (__GNUC__ >= 4) || \
++    (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
+ #define PR_VISIBILITY_DEFAULT __attribute__((visibility("default")))
+ #else
+ #define PR_VISIBILITY_DEFAULT