The module is not supported. Since the Anope team did not write it, we do not support it. This module does not come with Anope therefore we do not support it. Anope is however smart enough to dynamiclly detect modules placed in the source directory and will try to compile said modules along with the rest of Anope. This is for your convenience only. You can take a text file and rename it blah.c and place it in the modules directory and Anope will try to compile it, but that by no means makes it "our Anope's" fault it can not compile.
your error: ns_joinhelpchan.c:53: error: too few arguments to function `anope_cmd_svsjoin' is because anope_cmd_svsjoin was updated in 1.7.20 and the module author has not corrected the code to handle the change.
[Edited on 22-1-2008 by katsklaw]