anchor.diff:        "--disable-debug"
         "--disable-win32-registry"
       ] ++ lib.optionals (crossMingw && targetPlatform.isx86_32) [
  +      # See Note [Windows Exception Handling]
         "--enable-sjlj-exceptions"
  +      "--with-dwarf2"
       ] else [
         (if crossDarwin then "--with-sysroot=${lib.getLib libcCross}/share/sysroot"
          else                "--with-headers=${lib.getDev libcCross}${libcCross.incdir or "/include"}")
  
positive.code:       "--disable-nls"
        # To keep ABI compatibility with upstream mingw-w64
        "--enable-fully-dynamic-string"
      ] ++ lib.optionals (crossMingw && targetPlatform.isx86_32) [
        "--enable-sjlj-exceptions"
        "--with-dwarf2"
      ] ++ lib.optional (targetPlatform.libc == "newlib") "--with-newlib"
        ++ lib.optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
      );
  
negative.code: 
  assert cloog != null -> stdenv.lib.versionOlder version "5";
  assert langJava -> stdenv.lib.versionOlder version "7";
  
  # Note [Windows Exception Handling]
  # sjlj (short jump long jump) exception handling makes no sense on x86_64,
  # it's forcably slowing programs down as it produces a constant overhead.
  # On x86_64 we have SEH (Structured Exception Handling) and we should use
  # that. On i686, we do not have SEH, and have to use sjlj with dwarf2.
  # Hence it's now conditional on x86_32 (i686 is 32bit).
  #
  # ref: https://stackoverflow.com/questions/15670169/what-is-difference-between-sjlj-vs-dwarf-vs-seh
  
  
  let
    inherit (stdenv)
  