diff -up M2/Macaulay2/d/Makefile.in.no_Werror M2/Macaulay2/d/Makefile.in
--- M2/Macaulay2/d/Makefile.in.no_Werror	2011-03-30 14:31:53.000000000 -0500
+++ M2/Macaulay2/d/Makefile.in	2013-05-21 12:59:27.584737346 -0500
@@ -142,7 +142,7 @@ M2INCLUDES += -I@srcdir@/../regex
 
 # it's important that *our* directories get searched first:
 CPPFLAGS := $(M2INCLUDES) $(CPPFLAGS) $(M2_CPPFLAGS)
-CFLAGS += $(M2_CFLAGS) -Werror
+CFLAGS += $(M2_CFLAGS)
 ifeq "@__INTEL_COMPILER@" "no"
 CFLAGS += -Wno-unused-label
 endif
@@ -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