+set(CMAKE_EXTRA_INCLUDE_FILES stdlib.h)
+vlc_check_functions_exist(putenv getenv setenv)
+vlc_check_functions_exist(putenv getenv setenv)
+set(CMAKE_EXTRA_INCLUDE_FILES)
+
+set(CMAKE_EXTRA_INCLUDE_FILES stdio.h)
+vlc_check_functions_exist(snprintf asprintf)
+vlc_check_functions_exist(putenv getenv setenv)
+set(CMAKE_EXTRA_INCLUDE_FILES)
+
+set(CMAKE_EXTRA_INCLUDE_FILES unistd.h)
+vlc_check_functions_exist(isatty getcwd getuid)
+set(CMAKE_EXTRA_INCLUDE_FILES)
+
+set(CMAKE_EXTRA_INCLUDE_FILES sys/stat.h)
+vlc_check_functions_exist(lstat fstat stat)
+set(CMAKE_EXTRA_INCLUDE_FILES)
+
+set(CMAKE_REQUIRED_LIBRARIES)
+