Stefan Fiedler:

package/public/nspr/nspr.desc

@@ -41,6 +41,7 @@
 [M] The ROCK Linux Project
 
 [C] extra/development
+[F] CORE
 
 [L] MPL
 [S] Stable

package/x11/mozilla/mozilla.conf

@@ -65,7 +65,7 @@ mk_add_options BUILD_OFFICIAL=1
 mk_add_options MOZILLA_OFFICIAL=1
 EOT
 
-	for lib in zlib libjpeg libpng libmng ; do
+	for lib in zlib libjpeg libpng libmng nspr ; do
 		if pkginstalled $lib ] ; then
 			echo ac_add_options --with-system-${lib#lib} >> .mozconfig
 		fi