Add recipe for lxml

And patch, because they happily hardcode -lm in there...

dev-python/lxml/patches/python_lxml-3.3.5.patchset

@@ -0,0 +1,31 @@
+From 72985b29a3f51785c7fb070080861c815e6d3edd Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fran=C3=A7ois=20Revol?= <revol@free.fr>
+Date: Tue, 29 Jul 2014 01:50:29 +0200
+Subject: [PATCH] Fix Haiku build (no libm)
+
+GRMBL !$*^= hardcoding
+---
+ setupinfo.py | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/setupinfo.py b/setupinfo.py
+index 4a1d150..4a5746d 100644
+--- a/setupinfo.py
++++ b/setupinfo.py
+@@ -186,9 +186,11 @@ def libraries():
+             libs = ['%s_a' % lib for lib in libs]
+         libs.extend(['zlib', 'WS2_32'])
+     elif OPTION_STATIC:
+-        libs = ['z', 'm']
++        libs = ['z']
+     else:
+-        libs = ['xslt', 'exslt', 'xml2', 'z', 'm']
++        libs = ['xslt', 'exslt', 'xml2', 'z']
++    if sys.platform[0:5] not in ('haiku','win32'):
++        libs.append('m')
+     return libs
+ 
+ def library_dirs(static_library_dirs):
+-- 
+1.8.3.4
+

dev-python/lxml/python_lxml-3.3.5.recipe

@@ -0,0 +1,72 @@
+SUMMARY="A Pythonic binding for the libxml2 and libxslt libraries"
+DESCRIPTION="
+	The lxml XML toolkit is a Pythonic binding for the C libraries \
+	libxml2 and libxslt. It is unique in that it combines the speed \
+	and XML feature completeness of these libraries with the simplicity \
+	of a native Python API, mostly compatible but superior to the \
+	well-known ElementTree API. The latest release works with all \
+	CPython versions from 2.4 to 3.3. See the introduction for more \
+	information about background and goals of the lxml project.
+"
+HOMEPAGE="
+	http://lxml.de/
+	http://pypi.python.org/pypi/lxml/
+	"
+SRC_URI="http://lxml.de/files/lxml-3.3.5.tgz"
+CHECKSUM_SHA256="6ad6949dc7eea744a30fba77a968dd5910f545220e58bcc813b9df5c793e318a"
+#FIXME: check exact license
+#gentoo says: LICENSE="BSD ElementTree GPL-2 PSF-2"
+LICENSE="GNU GPL v2"
+COPYRIGHT="2003-2010 Gustavo Niemeyer"
+REVISION="1"
+
+ARCHITECTURES="x86 x86_gcc2 x86_64"
+
+SOURCE_DIR="lxml-$portVersion"
+PATCHES="python_lxml-3.3.5.patchset"
+
+PROVIDES="
+	python_lxml = $portVersion
+	"
+
+REQUIRES="
+	haiku$secondaryArchSuffix >= $haikuVersion
+	lib:libxml2$secondaryArchSuffix
+	lib:libxslt$secondaryArchSuffix
+	lib:libz$secondaryArchSuffix
+	cmd:python
+	python_setuptools
+	"
+
+BUILD_REQUIRES="
+	haiku${secondaryArchSuffix}_devel >= $haikuVersion
+	devel:libxml2$secondaryArchSuffix
+	devel:libxslt$secondaryArchSuffix
+	devel:libz$secondaryArchSuffix
+	python_setuptools
+	"
+
+BUILD_PREREQUIRES="
+	cmd:python
+	cmd:gcc$secondaryArchSuffix
+	cmd:ld$secondaryArchSuffix
+	"
+
+BUILD()
+{
+	$portPackageLinksDir/cmd~python/bin/python setup.py build
+}
+
+INSTALL()
+{
+	# GENERIC: all python_setuptools-based installs need this
+	export PATH="$portPackageLinksDir/cmd~python/bin:$PATH"
+	pythonVersion=$(python --version 2>&1 | sed 's/Python //' | head -c3)
+	installLocation=$prefix/lib/python$pythonVersion/vendor-packages/
+	export PYTHONPATH=$installLocation:$PYTHONPATH
+	mkdir -p $installLocation
+
+	python setup.py install \
+		--single-version-externally-managed \
+		--root=/ --prefix=$prefix
+}