tweak gcc detection

Author: jjallaire

src/Makevars

@@ -64,7 +64,7 @@ tbb:
 	cd tbb/src; \
 	if [[ "$(CC)" == clang* ]]; then \
 	   $(MAKE) cpp0x=1 compiler=clang $(MAKE_ARGS); \
-	elif [[ "$(CC)" == gcc* ]]; then \
+	elif [[ "$(CC)" == *gcc* ]]; then \
 	   $(MAKE) cpp0x=1 compiler=gcc $(MAKE_ARGS); \
 	else \
 	   $(MAKE) cpp0x=1 $(MAKE_ARGS); \