Comment 4 for bug 1551797

Hi,
this fix actually broke lxml for me. We are using lxml in multiple threads. Unfortunately, unlike the libxml2 version (xmlSetGenericErrorFunc), the libxslt version (xsltSetGenericErrorFunc) is not thread safe, but is a global. So it cannot be safely used in multithreaded scenarios. Unless it is fixed in libxslt, the best thing to do in lxml is I think to make a build switch that would turn xsltSetGenericErrorFunc off.