--- webkitgtk-2.48.2.old/Source/cmake/OptionsGTK.cmake
+++ webkitgtk-2.48.2/Source/cmake/OptionsGTK.cmake
@@ -6,6 +6,7 @@
 SET_PROJECT_VERSION(2 48 2)
 
 set(USER_AGENT_BRANDING "" CACHE STRING "Branding to add to user agent string")
+set(THREADS_PREFER_PTHREAD_FLAG ON)
 
 find_package(GLIB 2.70.0 REQUIRED COMPONENTS gio gio-unix gobject gthread gmodule)
 find_package(Cairo 1.16.0 REQUIRED)