You seem to be having a lot of trouble compiling webpositive specifically - i sympathise was quite frustrating for me at first also.
Some links to help: Webpositive trac - and build instructions (still outdated) http://webpositive.haiku-os.org/Webpositive mailing list - subscribe / just read the archive you will notice similar issues. October 2011 has my userbuild to build a gcc4 only haiku with icu and webpositive dependencies.
//www.freelists.org/list/haiku-webkit //www.freelists.org/archive/haiku-webkit/ Webpositive trac tickets - problems already reported / create new tickets http://webpositive.haiku-os.org/report/1 Hope this helps in some way, - Vooshy
