Both versions in the overlay right now fail to compile for me. That is 0.13.0.4-r1 as well as r2. 0.13.0.4 from the tree builds just fine. Reproducible: Always
Created attachment 412934 [details] build.log for 0.13.0.4-r1
Created attachment 412936 [details] build.log for 0.13.0.4-r2
Created attachment 412938 [details] emerge --info dev-haskell/gtk2hs-buildtools
merge conflicts occured while syncing the overlay. -r3 fixed it.