Created attachment 524350 [details] emerge --info The cmake configure fails to find librhash includes.
Created attachment 524352 [details] build log cmake-3.10.3
Could NOT find LibRHash (missing: LibRHash_INCLUDE_DIR) do you have app-crypt/rhash installed? Does (re)install the package fix it?
Oh, wait. It's an issue with latest rhash release... *** This bug has been marked as a duplicate of bug 650840 ***