diff -up Macaulay2-1.5/Macaulay2/d/Makefile.in.no_Werror Macaulay2-1.5/Macaulay2/d/Makefile.in
--- Macaulay2-1.5/Macaulay2/d/Makefile.in.no_Werror	2012-07-22 07:14:41.605878616 -0500
+++ Macaulay2-1.5/Macaulay2/d/Makefile.in	2012-07-22 07:22:14.957210945 -0500
@@ -156,8 +156,8 @@ endif
 # CXXFLAGS += -std=c++98
 # CXXFLAGS += -pedantic-errors
 
-CFLAGS   += -Wreturn-type -Werror
-CXXFLAGS += -Wreturn-type -Werror
+CFLAGS   += -Wreturn-type
+CXXFLAGS += -Wreturn-type
 
 python-c.o : | python-exports.h.tmp
 M2lib.o scclib.o : | interp-exports.h.tmp