--- src.tmp/core/Makefile
+++ src/core/Makefile
@@ -26,7 +26,7 @@
 
 OPTFLAGS =
 INCLUDES = -I$(SRC)/include -I$(com32)/include -I$(com32)/include/sys -I$(com32)/lib \
-	-I$(SRC)/lwip/src/include -I$(SRC)/lwip/src/include/ipv4 -I$(SRC)/fs/pxe
+	-I$(SRC)/lwip/src/include -I$(SRC)/lwip/src/include/ipv4 -I$(SRC)/fs/pxe $(EXTRA_CFLAGS)
 
 # This is very similar to cp437; technically it's for Norway and Denmark,
 # but it's unlikely the characters that are different will be used in
--- src.tmp/extlinux/Makefile
+++ src/extlinux/Makefile
@@ -17,10 +17,10 @@
 include $(MAKEDIR)/syslinux.mk
 
 OPTFLAGS = -g -Os
-INCLUDES = -I$(SRC) -I$(objdir) -I$(SRC)/../libinstaller
+INCLUDES = -I$(SRC) -I$(objdir) -I$(SRC)/../libinstaller $(EXTRA_CFLAGS)
 CFLAGS	 = $(GCCWARN) -Wno-sign-compare -D_FILE_OFFSET_BITS=64 \
 	   $(OPTFLAGS) $(INCLUDES)
-LDFLAGS	 = 
+LDFLAGS	 = $(EXTRA_LDFLAGS) 
 
 SRCS     = main.c \
 	   mountinfo.c \
--- src.tmp/utils/Makefile
+++ src/utils/Makefile
@@ -17,8 +17,8 @@
 VPATH = $(SRC)
 include $(MAKEDIR)/syslinux.mk
 
-CFLAGS   = $(GCCWARN) -Os -fomit-frame-pointer -D_FILE_OFFSET_BITS=64 -I$(SRC)
-LDFLAGS  = -O2
+CFLAGS   = $(GCCWARN) -Os -fomit-frame-pointer -D_FILE_OFFSET_BITS=64 -I$(SRC) $(EXTRA_CFLAGS)
+LDFLAGS  = -O2 $(EXTRA_LDFLAGS)
 
 C_TARGETS	 = isohybrid gethostip memdiskfind
 SCRIPT_TARGETS	 = mkdiskimage