diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9a9bd0..a9d5206 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,7 +61,27 @@ IF (WIN32)
   # Ignore warning C4996: 'strncpy'
   ADD_DEFINITIONS("-D_CRT_SECURE_NO_WARNINGS=1")
 ELSE()
-  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wformat=2 -std=gnu99 -O2 -g")
+  INCLUDE(CheckCCompilerFlag)
+  CHECK_C_COMPILER_FLAG("-Wall" COMPILER_HAS_WALL)
+  IF (COMPILER_HAS_WALL)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
+  ENDIF()
+  CHECK_C_COMPILER_FLAG("-Wextra" COMPILER_HAS_WEXTRA)
+  IF (COMPILER_HAS_WEXTRA)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wextra")
+  ENDIF()
+  CHECK_C_COMPILER_FLAG("-Wformat=2" COMPILER_HAS_WFORMAT)
+  IF (COMPILER_HAS_WFORMAT)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wformat=2")
+  ENDIF()
+  CHECK_C_COMPILER_FLAG("-std=gnu99" COMPILER_HAS_STD_GNU99)
+  CHECK_C_COMPILER_FLAG("-std=c99" COMPILER_HAS_STD_C99)
+  IF (COMPILER_HAS_STD_GNU99)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
+  ELSEIF (COMPILER_HAS_STD_C99)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+  ENDIF()
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -g")
 ENDIF()
 
 INCLUDE_DIRECTORIES(${pkgconf_SOURCE_DIR} ${pkgconf_BINARY_DIR})