re-enable glibc workaround
re-enable glibc workaround

lightmare/mapnik,lightmare/mapnik,lightmare/mapnik,tomhughes/mapnik,mapnik/mapnik,tomhughes/mapnik,tomhughes/mapnik,mapnik/mapnik,tomhughes/mapnik,lightmare/mapnik,mapnik/mapnik,mapnik/mapnik