non-obvious ./configure error message when asciidoc isn't installed
I just saw a user build Tor from git, and he didn't have asciidoc installed, and ./configure gave him ``` echo "=================================="; echo; echo "You need asciidoc installed to be able to build the manpage."; echo "To build without manpages, use the --disable-asciidoc argument"; echo "when calling configure."; echo; echo "=================================="; exit 1; ``` which he interpreted as a successful run. We should make the above message more clear that it's a failure case.
issue