{ stdenv, fetchurl, zlib, xz, python ? null, pythonSupport ? true, findXMLCatalogs }: assert pythonSupport -> python != null; #TODO: share most stuff between python and non-python builds, perhaps via multiple-output let version = "2.9.2"; in stdenv.mkDerivation (rec { name = "libxml2-${version}"; src = fetchurl { url = "ftp://xmlsoft.org/libxml2/${name}.tar.gz"; sha256 = "1g6mf03xcabmk5ing1lwqmasr803616gb2xhn7pll10x2l5w6y2i"; }; buildInputs = stdenv.lib.optional pythonSupport python # Libxml2 has an optional dependency on liblzma. However, on impure # platforms, it may end up using that from /usr/lib, and thus lack a # RUNPATH for that, leading to undefined references for its users. ++ (stdenv.lib.optional stdenv.isFreeBSD xz); propagatedBuildInputs = [ zlib findXMLCatalogs ]; passthru = { inherit pythonSupport version; }; enableParallelBuilding = true; meta = { homepage = http://xmlsoft.org/; description = "An XML parsing library for C"; license = "bsd"; platforms = stdenv.lib.platforms.unix; maintainers = [ stdenv.lib.maintainers.eelco ]; }; } // stdenv.lib.optionalAttrs pythonSupport { configureFlags = "--with-python=${python}"; # this is a pair of ugly hacks to make python stuff install into the right place preInstall = ''substituteInPlace python/libxml2mod.la --replace "${python}" "$out"''; installFlags = ''pythondir="$(out)/lib/${python.libPrefix}/site-packages"''; } // stdenv.lib.optionalAttrs (!pythonSupport) { configureFlags = "--with-python=no"; # otherwise build impurity bites us })