There are a few changes in glibc-2.10 that might make your software fail to build with it, please refer to my blog post  if you're not sure what the problem is.
And no I don't usually provide emerge --info with these bugs because they are caused by glibc-2.10!
Created attachment 194004 [details]
Created attachment 196866 [details, diff]
fixes the constness of char pointers
Fixes the two spots that needed char pointers constified with glibc210.
Fixed in gnucap-0.35.20090611, thanks for the patch.