X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=acinclude.m4;h=e4fa5e6210538a52a5db5103fa4e3301f187c77c;hb=342045e17750e755558616f7fd826470e9b11a7e;hp=e37a316dffa97a99d069ed2bd0687f591deca7d9;hpb=58fda1dab104041fc693032475ec4662c1a52849;p=openvswitch

diff --git a/acinclude.m4 b/acinclude.m4
index e37a316d..e4fa5e62 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -111,6 +111,16 @@ AC_DEFUN([OVS_CHECK_VETH], [
   fi
 ])
 
+AC_DEFUN([OVS_CHECK_GRE], [
+  AC_MSG_CHECKING([whether to build gre module])
+  if test "$sublevel" -ge 18; then
+    AC_MSG_RESULT([yes])
+    AC_SUBST([BUILD_GRE], 1)
+  else
+    AC_MSG_RESULT([no])
+  fi
+])
+
 AC_DEFUN([OVS_CHECK_LOG2_H], [
   AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
   if test -e $KSRC26/include/linux/log2.h; then
@@ -153,6 +163,7 @@ AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
   OVS_CHECK_LOG2_H
   OVS_CHECK_VETH
+  OVS_CHECK_GRE
   if cmp -s datapath/linux-2.6/kcompat.h.new \
             datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
     rm datapath/linux-2.6/kcompat.h.new