From 74d76532c7aaa1d42fc9b1cd6b5d82798983e9d2 Mon Sep 17 00:00:00 2001
From: lahiker42 <lahiker42@00440858-1255-0410-a3e6-75ea37f81c3a>
Date: Wed, 4 Mar 2009 22:12:52 +0000
Subject: [PATCH] check for protobuf..

git-svn-id: https://protobuf-c.googlecode.com/svn/trunk@168 00440858-1255-0410-a3e6-75ea37f81c3a
---
 configure.ac | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/configure.ac b/configure.ac
index a7cf2b4..dd1f044 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,6 +9,30 @@ AC_PROG_LIBTOOL
 AC_PATH_PROG(PROTOC, protoc)
 AC_CHECK_HEADERS(inttypes.h)
 
+# Check for the protobuf library.
+AC_LANG_PUSH([C++])
+AC_CHECK_HEADER(google/protobuf/stubs/common.h,,
+                [AC_MSG_ERROR([
+ERROR: protobuf headers are required.
+
+You must either install protobuf from google,
+or if you have it installed in a custom location
+you must add '-Iincludedir' to CXXFLAGS
+and '-Llibdir' to LDFLAGS.
+])])
+pbc_savelibs="$LIBS"
+LIBS="$LIBS -lprotoc"
+AC_TRY_LINK([#include <google/protobuf/compiler/command_line_interface.h>],
+            [google::protobuf::compiler::CommandLineInterface cli;],
+	    [],
+	    [AC_MSG_ERROR([
+ERROR:
+protobuf test program failed to link:
+perhaps you need to add -Llibdir to your LDFLAGS.])])
+LIBS="$pbc_savelibs"
+AC_LANG_POP()
+
+
 dnl  ------ define IS_LITTLE_ENDIAN ------
 knows_endianness=0
 AC_CHECK_HEADERS([endian.h], [has_endian_h=1; knows_endianness=1], [has_endian_h=0])