I was also bitten by this. Oddly enough this breaks rebar/reltool (erlang build tools).
tom@desktop:~/Source/xxxx $ ./rebar compile generate ==> ranch (compile) ==> cowboy (compile) ==> rel (compile) ==> xxxx (compile) ==> rel (generate) ERROR: Unable to generate spec: read file info /usr/lib/erlang/man/man1/python3.1 failed ERROR: Unexpected error: rebar_abort ERROR: generate failed while processing /home/tom/Source/xxxx/rel: rebar_abort tom@desktop:~/Source/xxxx $ sudo rm -f /usr/lib/erlang/man/man1/python3.1 [sudo] password for tom: tom@desktop:~/Source/xxxx $ ./rebar compile generate ==> ranch (compile) ==> cowboy (compile) ==> rel (compile) ==> xxxx (compile) ==> rel (generate) tom@desktop:~/Source/xxxx $ -- *Tom Lee */ http://tomlee.co / @tglee <http://twitter.com/tglee>