--- compiler/Makefile.unix.orig	2018-01-31 17:36:03.000000000 -0600
+++ compiler/Makefile.unix	2018-01-31 18:07:17.000000000 -0600
@@ -167,7 +167,6 @@
 
 ifeq ($(system), Darwin)
     CXXFLAGS += -I /opt/local/include
-    CXXFLAGS += -stdlib=libc++
 else
     ifneq ($(findstring MINGW32, $(system)),)
         CXXFLAGS += -O1 -I/usr/include