Compiles ok here:
cat /var/log/portage/sys-devel\:bc-1.06.95-r2\:20150713-142711.log | wgetpaste
Your paste can be seen here: https://bpaste.net/show/83f86c66377d
When emerge/compile fails you need to post the whole build.log
Use wgetpaste,check then post "Your paste can be seen here:" link.
cat /var/tmp/portage/sys-devel/bc-1.06.95-r2/temp/build.log | wgetpaste
hi friend.... so lets pull out the relevant info....
Total: 20 packages (2 upgrades, 18 new, 5 uninstalls), Size of downloads: 20 kB
Conflict: 28 blocks (28 unsatisfied)
!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:
dev-libs/nettle:0
(dev-libs/nettle-3.1::gentoo, ebuild scheduled for merge) pulled in by
(no parents that aren't satisfied by other packages in this slot)
(dev-libs/nettle-2.7.1-r4::gentoo, installed) pulled in by
<dev-libs/nettle-3[gmp,abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?] required by (net-libs/gnutls-3.3.15::gentoo, installed)
28 blocks WOW something bads going on with your system..... what abi is your system? x86_64? nettle 3.1 and nettle 2.7 are having a battle....
you basically have 2 options... remove the blocking packages, or masking the package that is conflicting with your existing system.... both options have perils... though the second option can cause more blockers if it's being pulled in by another package.
required by (net-libs/gnutls-3.3.15::gentoo, installed)
soooo i would try masking nettle 3.1 to avert the whole ugly nightmare. i actually have nettle 2.7 and am being suggested update to 3.1 so ill try to reproduce this.