anchor.diff:    postInstall = let
       # References *not* to nuke from (sys)config files
       keep-references = concatMapStringsSep " " (val: "-e ${val}") ([
  -      (placeholder "out")
  +      (placeholder "out") libxcrypt
       ] ++ optionals tzdataSupport [
         tzdata
       ]);
  
positive.code: , bluez ? null, bluezSupport ? false
  , zlib
  , tzdata ? null
  , self
  , configd
  , autoreconfHook
  
negative.code:     # Never even try to use lchmod on linux,
      # don't rely on detecting glibc-isms.
      "ac_cv_func_lchmod=no"
    ] ++ optionals (libxcrypt != null) [
      "CFLAGS=-I${libxcrypt}/include"
      "LIBS=-L${libxcrypt}/lib"
    ] ++ optionals tzdataSupport [
      "--with-tzpath=${tzdata}/share/zoneinfo"
    ] ++ optional static "LDFLAGS=-static";
  