diff --git a/freeglut/freeglut/CMakeLists.txt b/freeglut/freeglut/CMakeLists.txt
index b5e1920..828b7b2 100644
--- a/freeglut/freeglut/CMakeLists.txt
+++ b/freeglut/freeglut/CMakeLists.txt
@@ -195,6 +195,14 @@ IF(WIN32)
     ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS)
 ENDIF()
 
+IF(CMAKE_COMPILER_IS_GNUCC)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -pedantic")
+  IF(!ANDROID)
+    # not setting -ansi as EGL/KHR headers doesn't support it
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ansi")
+  ENDIF()
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
+
 if(UNIX AND NOT ANDROID)
     FIND_PACKAGE(X11 REQUIRED)
     LIST(APPEND LIBS ${X11_LIBRARIES})