--- src/liblzma/Makefile.in
+++ src/liblzma/Makefile.in
@@ -578,7 +578,7 @@
 CCASDEPMODE = @CCASDEPMODE@
 CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
-CFLAGS = @CFLAGS@
+CFLAGS = @CFLAGS@ $(EXTRA_CFLAGS)
 CFLAG_VISIBILITY = @CFLAG_VISIBILITY@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@