contribs: fix Makefile syntax

extras/contrib/src/contrib-src.mak

@@ -35,11 +35,11 @@ include ./packages.mak
 # Set a clean environment
 # ***************************************************************************
 
-#ifdef HAVE_DARWIN_OS
+ifdef HAVE_DARWIN_OS
 export PATH := $(PREFIX)/bin:$(EXTRA_PATH):/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:
-#else
+else
 export PATH := $(PREFIX)/bin:$(EXTRA_PATH):$(PATH)
-#endif
+endif
 export PKG_CONFIG_PATH
 export PKG_CONFIG_LIBDIR = $(PREFIX)/lib/pkgconfig
 export MACOSX_DEPLOYMENT_TARGET = $(SDK_TARGET)