[Serusers] SER voicemail installation problem

Hi, I have installed SER witch is runnig fine, but now I'm trying to implement voicemail, but I don't understand who to do it because the information I’m see it’s ambiguous. I tried to follow the instructions at this URL: http://www.iptel.org/ser/doc/prerelease/x1294.html where it says that I “must edit Ser's Makefile.defs file and uncomment the line with '-DVOICE_MAIL' and '-D_TOTAG'”, but when I search those lines in that file, I can’t find it! To overcome that problem, I included that flags in the makefile and then compiled again SER, however I couldn’t compile the voicemail application like it instructs in that webpage because there is no ~/voicemail directory!! Is this guide too old that voicemail installation is no longer done this way? Or what have I done wrong? I’m using ser-0.9.0, however in the latest release 0.9.6, I’ve seen that it’s Makefile.defs hasn’t also those flags to uncomment!! Best regards, Ricardo.