From 501e67af9e68e3cdd015b18f8612cf892cd627c7 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tomtheengineer@gmail.com>
Date: Fri, 23 Mar 2012 18:15:48 -0700
Subject: [PATCH] Set _topdir explicitly.

This fixes CentOS-based builds.
---
 Modules/CPackRPM.cmake |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/Modules/CPackRPM.cmake b/Modules/CPackRPM.cmake
index 442d7c4..cba746f 100644
--- a/Modules/CPackRPM.cmake
+++ b/Modules/CPackRPM.cmake
@@ -899,6 +899,7 @@ IF(RPMBUILD_EXECUTABLE)
   # Now call rpmbuild using the SPECFILE
   EXECUTE_PROCESS(
     COMMAND "${RPMBUILD_EXECUTABLE}" -bb
+            --define "_topdir ${CPACK_RPM_DIRECTORY}"
             --buildroot "${CPACK_RPM_DIRECTORY}/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}"
             "${CPACK_RPM_BINARY_SPECFILE}"
     WORKING_DIRECTORY "${CPACK_TOPLEVEL_DIRECTORY}/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}"
-- 
1.7.9