On Mar 3, 2011, at 4:52 PM, Marko Käning wrote: > > I want A to be dependent on either B-release or B-devel, exclusively! > > Say, the user has installed B-devel before installing port A: In that case I > want to let port A accept B-devel as the default dep. > If, however, B-release is installed, than that one should be accepted. > > How can I test in the portfile for already installed ports?
Usually this is done with bin/lib/path style dependencies (instead of port) So, you pick something in B that port A needs to have there (a library, binary, header file) and depend on that. MacPorts will install the port you choose (which should be B-release by default) if the file isn't found. If the file is there (from either B-release or B-devel), it won't install anything. You can have a variant which flips which port gets installed (or depends with a port: style dependency instead) if you think that that will make things easier for the end user as well. For example, if you want to depend on either mysql5 or mysql5-devel, you could use: path:bin/mysql_config5:mysql5 (which says, look for mysql_config5 in $prefix/bin, if it's not there install the mysql5 port). This could also be written as: bin:mysql_config5:mysql5 If you wanted to depend on libsdl.dylib from either libsdl or libsdl-devel, you could use: lib:libsdl:libsdl -- Daniel J. Luke +========================================================+ | *---------------- [email protected] ----------------* | | *-------------- http://www.geeklair.net -------------* | +========================================================+ | Opinions expressed are mine and do not necessarily | | reflect the opinions of my employer. | +========================================================+ _______________________________________________ macports-dev mailing list [email protected] http://lists.macosforge.org/mailman/listinfo.cgi/macports-dev
