component/sysetmd: add to provide libudev.

component/systemd/buildout.cfg

+[buildout]
+extends =
+  ../coreutils/buildout.cfg
+  ../gettext/buildout.cfg
+  ../gperf/buildout.cfg
+  ../intltool/buildout.cfg
+  ../libcap/buildout.cfg
+  ../perl/buildout.cfg
+  ../perl-XML-Parser/buildout.cfg
+  ../pkgconfig/buildout.cfg
+  ../util-linux/buildout.cfg
+  ../xz-utils/buildout.cfg
+
+[systemd]
+recipe = slapos.recipe.cmmi
+# XXX This version requires Linux kernel >= 3.7.
+url = https://www.freedesktop.org/software/systemd/systemd-221.tar.xz
+md5sum = b4d5a253841cf28a98b7ec99c45e3716
+depends =
+  ${perl-XML-Parser:location}
+location = ${buildout:parts-directory}/${:_buildout_section_name_}
+make-options = rootprefix=${:location} SYSTEM_SYSVINIT_PATH=${:location}/etc/init.d
+environment =
+  PATH=${coreutils:location}/bin:${gettext:location}/bin:${gperf:location}/bin:${intltool:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  CPPFLAGS=-I${libcap:location}/include -I${util-linux:location}/include
+  LDFLAGS=-L${libcap:location}/lib -Wl,-rpath=${libcap:location}/lib -L${util-linux:location}/lib -Wl,-rpath=${util-linux:location}/lib
+  PKG_CONFIG_PATH=${util-linux:location}/lib/pkgconfig