Hi, should not sys/cpuset.h provide also CPU_SETSIZE and not only __CPU_SETSIZE ? for what I see in similar enviroment CPU_* macros refer to CPU_SETSIZE https://www.gnu.org/software/libc/manual/html_node/CPU-Affinity.html http://man7.org/linux/man-pages/man3/CPU_SET.3.html I hit the issue building guile 2.2.6 Regards Marco -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple