diff -Naur freecad-0.14.3702.orig/src/CMakeLists.txt freecad-0.14.3702/src/CMakeLists.txt
--- freecad-0.14.3702.orig/src/CMakeLists.txt	2015-05-28 11:24:13.393935311 -0500
+++ freecad-0.14.3702/src/CMakeLists.txt	2015-05-28 11:24:03.937354886 -0500
@@ -1,5 +1,7 @@
-
-add_subdirectory(Build)
+# Do not generate a new Version.h if the source is a release tarball.
+if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/Build/Version.h)
+    add_subdirectory(Build)
+endif()
 add_subdirectory(Base)
 add_subdirectory(App)
 add_subdirectory(Main)