--- a/Makefile
+++ b/Makefile
@@ -108,16 +108,6 @@
   BIT=32bit
 endif
 
-ifeq ($(m32),yes)
-  GTH_CFLAGS += -m32
-  GTH_LDFLAGS += -m32
-endif
-
-ifeq ($(m64),yes)
-  GTH_CFLAGS += -m64
-  GTH_LDFLAGS += -m64
-endif
-
 # libraries for which we build replacements (that also appear in dependencies)
 #EXP_LDLIBS+=-lz -lbz2 -lm -ldl
 #OVERRIDELIBS:=../genometools/lib/libbz2.a