Feel free to downgrade this if you think appropriate, but given that 4.8 is scheduled to be removed from stretch at some point, this will eventually become grave for guile-2.0. (The problem appears to affect gcc-4.9 as well.)
For reference, it looks like a similar problem on armhf may have been fixed: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764532 For reference, I'm running a build on harris.debian.org (armhf) which has already made it past the invocation that failed. Thanks -- Rob Browning rlb @defaultvalue.org and @debian.org GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4