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

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{ stdenv, fetchurl, zlib, xz, python ? null, pythonSupport ? true }:
assert pythonSupport -> python != null;
#TODO: share most stuff between python and non-python builds, perhaps via multiple-output
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let
version = "2.9.1";
in
stdenv.mkDerivation (rec {
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name = "libxml2-${version}";
src = fetchurl {
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url = "ftp://xmlsoft.org/libxml2/${name}.tar.gz";
sha256 = "1nqgd1qqmg0cg09mch78m2ac9klj9n87blilx4kymi7jcv5n8g7x";
};
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);
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propagatedBuildInputs = [ zlib ];
setupHook = ./setup-hook.sh;
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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;
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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
})