I suggest to try the search pattern "_[A-Z]+" on the source files. You will find some places where names begin with an underscore and an uppercase letter. Examples: - _TOR_ADDRESS_H https://svn.torproject.org/cgi-bin/viewvc.cgi/tor/trunk/src/common/address.h?revision=17867&view=markup - _SHORT_FILE_ https://svn.torproject.org/cgi-bin/viewvc.cgi/tor/trunk/src/common/compat.h?revision=18743&view=markup This does not fit to the expected naming conventions of the C language standard. http://en.wikipedia.org/wiki/Reserved_identifier See also section "7.1.3 Reserved identifiers". http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1124.pdf [Automatically added by flyspray2trac: Operating System: All] **Trac**: **Username**: elfring