diff --git a/m1/perf/Makefile b/m1/perf/Makefile
index 8ab0ad1..242eb8d 100644
--- a/m1/perf/Makefile
+++ b/m1/perf/Makefile
@@ -6,11 +6,12 @@ M1SWLIB_DIR=$(M1)/milkymist/software/libfpvm
 #CFLAGS_EXTRA=-DCOMP_DEBUG
 CFLAGS_EXTRA=
 CFLAGS_PROF=-pg
-CFLAGS_COMMON=-Wall -g $(CFLAGS_PROF) $(CFLAGS_EXTRA)
+CFLAGS_COMMON=-Wall -g $(CFLAGS_PROF) $(CFLAGS_EXTRA) -DPRINTF_FLOAT
+CFLAGS_M=-fno-builtin #-nostdinc -fno-builtin
 CFLAGS=$(CFLAGS_COMMON) \
        -I$(COMPILER_DIR) \
        -Ifakes -I$(M1SWINC_DIR)
-LDFLAGS=-pg
+LDFLAGS=$(CFLAGS_PROF)
 LDLIBS=-L$(M1SWLIB_DIR) -lfpvm
 
 
@@ -26,13 +27,13 @@ main:		$(OBJS) $(LIBFPVM_A)
 
 $(COMPILER_O):
 		$(MAKE) -C $(COMPILER_DIR) CC=gcc \
-		    CFLAGS="$(CFLAGS_COMMON) -I$(M1SWINC_DIR) \
+		    CFLAGS="$(CFLAGS_COMMON) $(CFLAGS_M) -I$(M1SWINC_DIR) \
 		    -I$(shell pwd)/fakes" \
 		    compiler.o
 
 $(LIBFPVM_A):
 		$(MAKE) -C $(M1SWLIB_DIR) CC=gcc LD=gcc AR=ar RANLIB=ranlib \
-		    CFLAGS='$(CFLAGS_COMMON) $$(INCLUDES)'
+		    CFLAGS='$(CFLAGS_COMMON) $(CFLAGS_M) $$(INCLUDES)'
 
 clean:
 		$(MAKE) -C $(M1SWLIB_DIR) clean