Do not read non-capital makefile on MacOSX
diff --git a/main.cc b/main.cc
index ce9ee09..08d2d81 100644
--- a/main.cc
+++ b/main.cc
@@ -126,8 +126,10 @@
   if (g_makefile == NULL) {
     if (Exists("GNUmakefile")) {
       g_makefile = "GNUmakefile";
+#if !defined(__APPLE__)
     } else if (Exists("makefile")) {
       g_makefile = "makefile";
+#endif
     } else if (Exists("Makefile")) {
       g_makefile = "Makefile";
     } else {