--- build.mak.in
+++ build.mak.in
@@ -168,7 +168,7 @@
 export APP_CC := @CC@
 export APP_CXX := @CXX@
 export APP_CFLAGS := -DPJ_AUTOCONF=1\
-	@CFLAGS@\
+	@CFLAGS@ $(EXTRA_CFLAGS) \
 	$(PJ_VIDEO_CFLAGS) \
 	-I$(PJDIR)/pjlib/include\
 	-I$(PJDIR)/pjlib-util/include\
@@ -183,7 +183,7 @@
 	-L$(PJDIR)/pjsip/lib\
 	-L$(PJDIR)/third_party/lib\
 	$(PJ_VIDEO_LDFLAGS) \
-	@LDFLAGS@
+	@LDFLAGS@ $(EXTRA_LDFLAGS)
 export APP_LDXXFLAGS := $(APP_LDFLAGS)
 
 export APP_LIB_FILES = \
--- build/os-auto.mak.in
+++ build/os-auto.mak.in
@@ -1,10 +1,10 @@
 # @configure_input@
 
-export OS_CFLAGS   := $(CC_DEF)PJ_AUTOCONF=1 @CFLAGS@
+export OS_CFLAGS   := $(CC_DEF)PJ_AUTOCONF=1 @CFLAGS@ $(EXTRA_CFLAGS)
 
 export OS_CXXFLAGS := $(CC_DEF)PJ_AUTOCONF=1 @CXXFLAGS@
 
-export OS_LDFLAGS  := @LDFLAGS@ @LIBS@
+export OS_LDFLAGS  := @LDFLAGS@ $(EXTRA_LDFLAGS) @LIBS@
 
 export OS_SOURCES  :=