Fix cloud9 dependencies

component/cloud9/buildout.cfg

@@ -33,7 +33,7 @@ repository = https://github.com/ajaxorg/cloud9.git
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
 git-binary = ${git:location}/bin/git
 npm-binary = ${nodejs:location}/bin/node ${nodejs:location}/bin/npm
-environment = export GIT_SSL_NO_VERIFY=true; export PATH=${nodejs:location}/bin:${node-sm:location}/node_modules/sm/bin/:$PATH; export LDFLAGS=-L${libxml2:location}/lib; export HOME=${:location};
+environment = export GIT_SSL_NO_VERIFY=true; export PATH=${nodejs:location}/bin:${node-sm:location}/node_modules/sm/bin/:$PATH; export CPPFLAGS="-I${libxml2:location}/include -I${nodejs:location}/include"; export LDFLAGS="-L${libxml2:location}/lib -Wl,-rpath=${libxml2}:location}/lib"; export HOME=${:location};
 command = ${:environment} (${:git-binary} clone --quiet ${:repository} ${:location} && cd ${:location} && ${:git-binary} reset --hard ${:commit} && ${node-sm:location}/node_modules/.bin/sm install) || (rm -fr ${:location}; exit 1)
 update-command =