Fixed building

source/CMakeLists.txt

@@ -70,9 +70,15 @@ add_custom_target(
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wextra -Werror -Wmissing-declarations -fdiagnostics-color=always -lm")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wextra -Werror -Wmissing-declarations -fdiagnostics-color=always \
 	-O2 -pipe -fno-plt -fexceptions \
-        -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security \
+        -Wformat -Werror=format-security \
         -fstack-clash-protection -fcf-protection")
         
+        string(FIND "${CMAKE_CXX_FLAGS}" "-D_FORTIFY_SOURCE" FORTIFY_FOUND)
+        
+        if(FORTIFY_FOUND EQUAL -1)
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
+        endif()
+         
 set(SOURCE_FILES
         menu_os.h
         menu_os.cc