Don't do git.

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -241,8 +241,8 @@ endif()
 # version
 
 string(TIMESTAMP OJ_DATE "%Y-%m-%d")
-include(GetGitRevisionDescription)
-git_get_exact_tag(GIT_TAG)
+#include(GetGitRevisionDescription)
+#git_get_exact_tag(GIT_TAG)
 # Do not include a hash, if we are building a release tag
 if(NOT GIT_TAG)
 	# otherwise concatenate a version with hash
