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nixpkgs/pkgs/development/libraries/libxml2/default.nix

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Nix

{ 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
stdenv.mkDerivation (rec {
name = "libxml2-${version}";
version = "2.9.3";
src = fetchurl {
url = "http://xmlsoft.org/sources/${name}.tar.gz";
sha256 = "0bd17g6znn2r98gzpjppsqjg33iraky4px923j3k8kdl8qgy7sad";
};
outputs = [ "out" "doc" ];
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
})