Hi Erik,
gdk_string_width in gkfreq is used incorrectly (pre PangoFont migration), and it causes warnings during the build and possibly other errors. The fix is described in [1], and it's simply to replace the call to gdk_string_width with gkrellm_gdk_string_width.
Due to this problem this great plugin which I have been using for many years is being removed from the Gentoo repository [2], therefore I'd be grateful if you could put out a new version with the gdk_string_width problem fixed.
Thanks in advance and thanks for maintaining gkfreq alive!
Pietro
[1] http://www.mirrorservice.org/sites/members.dslextreme.com/users/billw/gkrellm/plugins2-reference.html
[2] http://bugs.gentoo.org/show_bug.cgi?id=339908
This is now fixed in version 2.1.