Hi, it's reported at https://github.com/SELinuxProject/setools/issues/110 While the API change is described in the commit message, SETools is not ready for this. I haven't found a way how to use COND_EXPR_T_RENAME_BOOL_BOOLEAN in Cython code so that SETools could be built with 3.6 and with older releases. I consider this as a blocker for 3.6 release and therefore I propose to revert this change and leave it for the next release together with the proper (if possible) fix of SETools. Objections? Petr