I am running Inkscape 0.48.2 on OS X 10.6.8 - been using it for the last few months. Frustrating at first, but I'm enjoying it now!

I have an SVG I have created in Inkscape that I need to get to a guy to engrave a metal panel. His machine runs g-code. He wants me to send him DXF (R12), or, failing that, HPGL/PLT.
I am half-way (he says, optimistically...!) through making a proper installation of UniConvertor and sK1. Currently my installer is making a good go of installing sK1, but is failing with errors relating to FreeType header files, specifically freetype/config/ftheader.h and freetype/fterrors.h. 'No such file or directory', the installer reckons - but they are there. Most odd...
Has anyone here had this problem? Also, does anyone know how to register on the sK1 forum? I have contacted them a few times via their contact page, but with no response. Unless I am being exceptionally daft, there seems no way of registering directly via the forum itself.
Thanks in advance for any help,
Tom