--- src/Makefile.in
+++ src/Makefile.in
@@ -82,7 +82,7 @@
 AWK = @AWK@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
-CFLAGS = @CFLAGS@
+CFLAGS = @CFLAGS@ $(EXTRA_CFLAGS)
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@
@@ -100,7 +100,7 @@
 INSTALL_SCRIPT = @INSTALL_SCRIPT@
 INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
 ISODATE = @ISODATE@
-LDFLAGS = @LDFLAGS@
+LDFLAGS = @LDFLAGS@ $(EXTRA_LDFLAGS)
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LTLIBOBJS = @LTLIBOBJS@