This seems related to bug #339157. Directly after upgrading sandbox from 1.6-r2 to 2.3-r1, I have multiple errors when trying to emerge packages. Both packages fail at the start of the 'make install' step. This is on x86 with hardened profile. Downgrading sandbox back to 1.6-r2 solved the issue, setting FEATURES=-sandbox also.
Created attachment 249948 [details] emerge --info output emerge --info output
Created attachment 249950 [details] neon-0.29.3-build.log complete build.log from neon. subversion fails at exactly the same time (i.e. right after starting the install)
Created attachment 249951 [details] neon-0.29.3-environment environment belonging to the build.log
probably a dupe of Bug 339157 rather than related *** This bug has been marked as a duplicate of bug 339157 ***