From c9097c74b6fdf6b457a0d1fb1c034c3e9d5fd8fe Mon Sep 17 00:00:00 2001
From: Matt McCormick <matt.mccormick@kitware.com>
Date: Mon, 21 May 2012 14:49:00 -0400
Subject: [PATCH] ExternalProject: Fix 'make' builds with Ninja (#13159)

Fix the build command when Ninja is the CMake Generator, but the
external project is created for a project that does not use CMake but
does use "make".
---
 Modules/ExternalProject.cmake | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 0353e4562..a0a9aead5 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -712,8 +712,12 @@ function(_ep_get_build_command name step cmd_var)
       endif()
     else() # if(cfg_cmd_id STREQUAL "configure")
       # Non-CMake project.  Guess "make" and "make install" and "make test".
-      # But use "$(MAKE)" to get recursive parallel make.
-      set(cmd "$(MAKE)")
+      if("${CMAKE_GENERATOR}" MATCHES "Makefiles")
+        # Try to get the parallel arguments
+        set(cmd "$(MAKE)")
+      else()
+        set(cmd "make")
+      endif()
       if(step STREQUAL "INSTALL")
         set(args install)
       endif()