diff --git a/src/js/core.js b/src/js/core.js
index 4b947c2..024b8f1 100644
--- a/src/js/core.js
+++ b/src/js/core.js
@@ -139,6 +139,8 @@ pmake.libs = function(target, if_str, nostr) {
 			function recursion(x) {
 				if(x instanceof pmake.LibraryProject) {
 					return pmake.libs(x, if_str);
+				} else if(!nostr && if_str) {
+					return [ if_str(x) ];
 				} else if(!nostr) {
 					return [ x ];
 				}