anchor.diff:      "--enable-libcurl_option"
       "--${if stdenv.cc.cc.isGNU then "enable" else "disable"}-libgcc"
       "--with-zlib"
  +    "--with-brotli"
       "--enable-ipv4"
       "--with-gssapi"
       "--without-winssl"
  
positive.code:     "--${if isFull then "with" else "without"}-librtmp"
      "--disable-versioned-symbols"
      "--without-winidn"
      "--${if isFull then "with" else "without"}-libidn"
      "--with-nghttp2"
      "--disable-sspi"
      "--enable-crypto-auth"
  
negative.code: , fetchurl
  , perl
  
  , brotli
  , c-ares
  , krb5_lib
  , libidn2
  