glew fix

Former-commit-id: e98d790285024f5470ecf3c3d4795b022e99e017

shared/cmake/CMakeLists.txt

@@ -324,7 +324,6 @@ if(LIBIGL_WITH_OPENGL)
     endif()
   endif()
   set(LIBIGL_OPENGL_EXTRA_LIBRARIES ${OPENGL_gl_LIBRARY})
-  list(APPEND LIBIGL_EXTRA_LIBRARIES ${LIBIGL_OPENGL_EXTRA_LIBRARIES})
 
   ### GLEW for linux and windows
   if((UNIX AND NOT APPLE) OR WIN32) ### Compile glew if needed
@@ -336,6 +335,8 @@ if(LIBIGL_WITH_OPENGL)
     list(APPEND LIBIGL_OPENGL_EXTRA_LIBRARIES "glew")
   endif()
 
+  list(APPEND LIBIGL_EXTRA_LIBRARIES ${LIBIGL_OPENGL_EXTRA_LIBRARIES})
+
   if(LIBIGL_WITH_OPENGL_GLFW)
     set(GLFW_INCLUDE_DIRS "${NANOGUI_DIR}/ext/glfw/include")
     if(NOT APPLE)