...

3rd/box2d/CMakeLists.txt

@@ -20,6 +20,8 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexceptions -O2")
 endif()
 
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
 add_library(
     box2d
     STATIC

3rd/cjson/CMakeLists.txt

@@ -16,6 +16,8 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexceptions -O2")
 endif()
 
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
 add_library(
     cjson
     STATIC