Sorry, Sebastien, just overloaded, thanks for pinging me!
Can I see the compiler invocation that causes
cc1plus: fatal error: /pbs/throng/ccin2p3/support/gadrat/software/centos-7-x86_64/root/build_v6-22-06/include/stdc-predef.h: Permission denied
compilation terminated.
e.g. by means of make VERBOSE=1?