From ec9d5feba1e3d72ca890a5aa22ceee8917c0a4d5 Mon Sep 17 00:00:00 2001
From: Geert Janssens <geert@kobaltwit.be>
Date: Tue, 30 Jan 2018 19:20:51 +0100
Subject: [PATCH] Allow user to override BUILDING_FROM_VCS

---
 CMakeLists.txt | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 283424ee2a..31a5928a4f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -134,16 +134,17 @@ EXECUTE_PROCESS(
   OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
-SET(BUILDING_FROM_VCS "NO")
-IF (GNC_VCS_INFO_RESULT EQUAL 0)
-  SET(BUILDING_FROM_VCS "YES")
-  # IF building from VCS, we need git
-  find_package(Git)
-  IF (NOT GIT_FOUND)
-    MESSAGE(SEND_ERROR "Looks like we're building from version control, but can't find git executable. Please set GIT_EXECUTABLE.")
-  ENDIF()
-ENDIF()
-
+if (NOT DEFINED BUILDING_FROM_VCS)
+    set (BUILDING_FROM_VCS "NO")
+    if (GNC_VCS_INFO_RESULT EQUAL 0)
+        set (BUILDING_FROM_VCS "YES")
+        # IF building from VCS, we need git
+        find_package (Git)
+        if (NOT GIT_FOUND)
+            message (SEND_ERROR "Looks like we're building from version control, but can't find git executable. Please set GIT_EXECUTABLE.")
+        endif()
+    endif()
+endif()
 
 
 IF (WIN32)