Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -37,12 +37,14 @@ set_target_properties(${PROJECT_NAME} PROPERTIES
     MACOSX_BUNDLE ON
 )
 
+if (GIT_COMMIT_HASH STREQUAL "")
 execute_process(
     COMMAND git -C ${CMAKE_CURRENT_SOURCE_DIR} rev-parse --short --verify HEAD
     OUTPUT_VARIABLE GIT_COMMIT_HASH
     OUTPUT_STRIP_TRAILING_WHITESPACE
     ERROR_QUIET
 )
+endif()
 
 if (GIT_COMMIT_HASH STREQUAL "")
     MESSAGE(WARNING "Could not determine git commit hash")
