diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12a784f..687f097 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,11 +10,14 @@ EXECUTE_PROCESS(
     OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
+IF(CMAKE_COMPILER_IS_GNUCC)
+    ADD_DEFINITIONS(-pipe -fsigned-char -Wall -Werror)
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
+
 ADD_DEFINITIONS(-DAPPID=fatelf)
 ADD_DEFINITIONS(-DAPPREV="${FATELF_VERSION}")
 
 INCLUDE_DIRECTORIES(include)
-ADD_DEFINITIONS(-Wall -Werror)
 
 ADD_LIBRARY(fatelf-utils STATIC utils/fatelf-utils.c)