This is my first attempt at writing a GTK application, and so probably has many bugs, but it works for me :^)
You can download the source package, gstar.tgz (373k). This package contains the starchart sources and datafiles so it's self-contained. gstar is at version 0.01. It requires GTK >= 1.2.0, and also requires gv/ghostview for viewing the charts.
Stephan Boettcher was kind enough to contribute a patch after trying gstar. I have not yet had time to incorporate this into the source, but here is the patch plus Stephan's explanation.
Below is the obligatory screen shot...
Allin Cottrell ( firstname.lastname@example.org), September 1, 1999.