From e1b67d0373b3cdc8e53836601b9b0f6372f84e70 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 26 Apr 2017 08:14:08 -0400
Subject: FindGLUT: Add library dependencies only if they exist

Fixes: #14060
---
 Modules/FindGLUT.cmake | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Modules/FindGLUT.cmake b/Modules/FindGLUT.cmake
index 02e6df0..88d4b29 100644
--- a/Modules/FindGLUT.cmake
+++ b/Modules/FindGLUT.cmake
@@ -120,10 +120,12 @@ if (GLUT_FOUND)
   # If not, we need some way to figure out what platform we are on.
   set( GLUT_LIBRARIES
     ${GLUT_glut_LIBRARY}
-    ${GLUT_Xmu_LIBRARY}
-    ${GLUT_Xi_LIBRARY}
-    ${GLUT_cocoa_LIBRARY}
     )
+  foreach(v GLUT_Xmu_LIBRARY GLUT_Xi_LIBRARY GLUT_cocoa_LIBRARY)
+    if(${v})
+      list(APPEND GLUT_LIBRARIES ${${v}})
+    endif()
+  endforeach()
 
   if(NOT TARGET GLUT::GLUT)
     add_library(GLUT::GLUT UNKNOWN IMPORTED)
-- 
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