--- a/cmake/update-version-info.sh	2015-12-20 08:38:33.000000000 -0500
+++ b/cmake/update-version-info.sh	2015-12-26 20:14:00.000000000 -0500
@@ -18,7 +18,7 @@
 GIT_COMMAND_EXISTS=1
 command -v git >/dev/null 2>&1 || GIT_COMMAND_EXISTS=0
 
-if [ $GIT_COMMAND_EXISTS -eq 0 ]; then
+if [ $GIT_COMMAND_EXISTS -eq 0 -o ! -d "${CMAKE_SOURCE_DIR}/.git" ]; then
     update_header "no vcs hash"
     exit 0
 fi