anchor.diff:      sha256 = "1khpasr6l0a8nfz6kcf3s81vgdab8fm2dj291n5r2s53k228kx2p";
     };
   
  -  patchPhase = ''
  +  postPatch = ''
       sed -i s,/usr/share/sgml/docbook/xml-dtd-4.1.2/,${docbook_xml_dtd_412}/xml/dtd/docbook/, \
         docsrc/*.xml
     '';
   
  -  configureFlags = lib.optional stdenv.isDarwin [
  -    "--with-libintl-prefix=/usr"
  -    "--with-libiconv-prefix=/usr"
  +  patches = [
  +    (fetchpatch {
  +      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/app-text/opensp/files/opensp-1.5.2-c11-using.patch?id=688d9675782dfc162d4e6cff04c668f7516118d0";
  +      sha256 = "04q14s8qsad0bkjmj067dn831i0r6v7742rafdlnbfm5y249m2q6";
  +    })
     ];
  -
  +  
     setupHook = ./setup-hook.sh;
   
     postFixup = ''
  
positive.code: { lib, stdenv, fetchurl, xmlto, docbook_xml_dtd_412, libxslt, docbook_xsl, autoconf, automake, gettext, libiconv, libtool}:
  
  stdenv.mkDerivation {
    name = "opensp-1.5.2";
  
negative.code:   preConfigure = if stdenv.isCygwin then "autoreconf -fi" else null;
  
    # need autoconf, automake, gettext, and libtool for reconfigure
    nativeBuildInputs = stdenv.lib.optionals stdenv.isCygwin [ autoconf automake libtool ];
  
    buildInputs = [ xmlto docbook_xml_dtd_412 libxslt docbook_xsl gettext libiconv ];
  
    doCheck = false; # fails
  
  