I've built various versions of Gcc many times on different machines, with no problems. I have a script to record my learnings, so I'm pretty sure I'm doing what I always do, but this time round I've hit a problem. This happens building Gcc 8.2 and 6.4, so it's not anything specific to latest version(s) My native C++ compiler reports g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23.0.1) Operating system is Linux [...] 4.1.12-124.19.7.el6uek.x86_64 #2 SMP Sat Sep 29 17:30:15 PDT 2018 x86_64 x86_64 x86_64 GNU/Linux And the machine is a VM. My first error are error: bits/c++config.h: No such file or directory error: ‘_GLIBCXX_END_NAMESPACE’ does not name a type Any idea how to fix these? Kind Regards Rob.