From e0cce7602b8a22a272a6de83b07b64c2b459c509 Mon Sep 17 00:00:00 2001
From: Florent Castelli <florent.castelli@gmail.com>
Date: Tue, 10 Jan 2017 01:19:58 +0100
Subject: [PATCH] cmake: Fix linking against system GLEW

---
 CMakeLists.txt          | 4 ++--
 ext/glew/CMakeLists.txt | 9 +++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index caa84b4c4a..a8dc0e169b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -960,8 +960,8 @@ if(ANDROID)
 endif()
 
 target_link_libraries(native ${LIBZIP_LIBRARY} ${ZLIB_LIBRARY} ${PNG_LIBRARY} rg_etc1 vjson udis86 ${RT_LIB} ${nativeExtraLibs} ${ATOMIC_LIB})
-if(TARGET glew)
-  target_link_libraries(native glew)
+if(TARGET Ext::GLEW)
+  target_link_libraries(native Ext::GLEW)
 endif()
 
 if(ANDROID)
diff --git a/ext/glew/CMakeLists.txt b/ext/glew/CMakeLists.txt
index b938d1cc07..60b1c69b08 100644
--- a/ext/glew/CMakeLists.txt
+++ b/ext/glew/CMakeLists.txt
@@ -1,5 +1,9 @@
-#find_package(GLEW)
-if(NOT GLEW_FOUND)
+find_package(GLEW)
+if(GLEW_FOUND)
+  add_library(system_glew INTERFACE)
+  add_library(Ext::GLEW ALIAS system_glew)
+  target_link_libraries(system_glew INTERFACE GLEW::GLEW)
+else()
   find_package(OpenGL REQUIRED)
   add_library(glew STATIC
     GL/glew.h
@@ -7,6 +11,7 @@ if(NOT GLEW_FOUND)
     GL/wglew.h
     glew.c
   )
+  add_library(Ext::GLEW ALIAS glew)
   target_link_libraries(glew PUBLIC ${OPENGL_LIBRARIES})
   target_compile_definitions(glew PUBLIC GLEW_STATIC)
   target_include_directories(glew PUBLIC . ${OPENGL_INCLUDE_DIR})