From 30dd14c991dfa3f48505537eaa13ff606b468b6f Mon Sep 17 00:00:00 2001
From: Sam Edwards <CFSworks@gmail.com>
Date: Thu, 3 Jan 2019 11:40:57 -0700
Subject: [PATCH] CMake: Fix "whitelisted property" error from CMake <3.8

---
 cmake/macros/PackageConfig.cmake | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cmake/macros/PackageConfig.cmake b/cmake/macros/PackageConfig.cmake
index 1b54027222..975ccc4559 100644
--- a/cmake/macros/PackageConfig.cmake
+++ b/cmake/macros/PackageConfig.cmake
@@ -364,8 +364,9 @@ function(export_packages filename)
             endforeach(config)
           endif()
 
-        else()
-          # This is an INTERFACE_LIBRARY
+        elseif(CMAKE_VERSION VERSION_GREATER "3.8")
+          # This is an INTERFACE_LIBRARY, and CMake is new enough to support
+          # IMPORTED_IMPLIB
           get_target_property(imported_libname "${head}" IMPORTED_LIBNAME)
           if(imported_libname)
             list(APPEND libraries ${imported_libname})