Moved threads package to X11 block.

CMakeLists.txt

@@ -17,15 +17,6 @@ option(BUILD_SHARED_LIBS "Build shared libraries" OFF)
 
 find_package(OpenGL REQUIRED)
 
-if (NOT WIN32)
-    set(CMAKE_THREAD_PREFER_PTHREADS YES)
-endif()
-
-find_package(Threads)
-if (CMAKE_THREAD_LIBS_INIT)
-    list(APPEND glfw_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
-endif()
-
 #--------------------------------------------------------------------
 # Enable all warnings on GCC, regardless of OS
 #--------------------------------------------------------------------
@@ -94,6 +85,12 @@ if (_GLFW_X11_GLX)
 
     find_package(X11 REQUIRED)
 
+    set(CMAKE_THREAD_PREFER_PTHREADS YES)
+    find_package(Threads)
+    if (CMAKE_THREAD_LIBS_INIT)
+        list(APPEND glfw_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
+    endif()
+
     # Set up library and include paths
     list(APPEND glfw_INCLUDE_DIRS ${X11_X11_INCLUDE_PATH} ${OPENGL_INCLUDE_DIR})
     list(APPEND glfw_LIBRARIES ${X11_X11_LIB} ${OPENGL_gl_LIBRARY})