anchor.diff:      "--${boolEn examplesSupport}-examples"
       "--disable-docs"
       #libc
  -    "--as=yasm"
  +    "--as=${if versionAtLeast source.version "1.6.2" then "nasm" else "yasm"}"
       "${if (sizeLimit != null) then "--size-limit=${sizeLimit}" else null}"
       "--disable-codec-srcs"
       "--disable-debug-libs"
  
positive.code: , fetchFromGitHub
  , fetchurl
  , lib
  , perl
  , yasm
  
  
negative.code: 
    nativeBuildInputs = [
      perl
    ] ++ (
      if versionAtLeast source.version "1.6.2" then [
        nasm
      ] else [
        yasm
      ]
    );
  
    postPatch = ''
      patchShebangs ./build/make/rtcd.pl
  