diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6bce40d..b783fb05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,31 +29,6 @@ set(BUILD_GUI_DEPS ON)
 set(ARCH "x86-64")
 set(BUILD_64 ON)
 
-function (add_c_flag_if_supported flag var)
-  string(REPLACE "-" "_" supported ${flag}_c)
-  check_c_compiler_flag(${flag} ${supported})
-  if(${${supported}})
-    set(${var} "${${var}} ${flag}" PARENT_SCOPE)
-  endif()
-endfunction()
-
-function (add_cxx_flag_if_supported flag var)
-  string(REPLACE "-" "_" supported ${flag}_cxx)
-  check_cxx_compiler_flag(${flag} ${supported})
-  if(${${supported}})
-    set(${var} "${${var}} ${flag}" PARENT_SCOPE)
-  endif()
-endfunction()
-
-function (add_linker_flag_if_supported flag var)
-  string(REPLACE "-" "_" supported ${flag}_ld)
-  string(REPLACE "," "_" supported ${flag}_ld)
-  check_linker_flag(${flag} ${supported})
-  if(${${supported}})
-    set(${var} "${${var}} ${flag}" PARENT_SCOPE)
-  endif()
-endfunction()
-
 find_package(Git)
 if(GIT_FOUND)
   if(NOT DEV_MODE)