Goddamnit

>>> Completed installing gcc-5.1.0 into /var/tmp/portage/cross-avr/gcc-5.1.0/image/

removing executable bit: usr/lib64/libcc1.la

 * QA Notice: Package triggers severe warnings which indicate that it
 *            may exhibit random runtime failures.
 * /var/tmp/portage/cross-avr/gcc-5.1.0/work/gcc-5.1.0/gcc/config/avr/gen-avr-mmcu-texi.c:84:17: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]

 * Please do not file a Gentoo bug and instead report the above QA
 * issues directly to the upstream developers of this software.
 * Homepage: http://gcc.gnu.org/

>>> Installing (1 of 1) cross-avr/gcc-5.1.0::crossdev
 * This package will overwrite one or more files that may belong to other
 * packages (see list below). You can use a command such as `portageq
 * owners / <filename>` to identify the installed package that owns a
 * file. If portageq reports that only one package owns a file then do
 * NOT file a bug report. A bug report is only useful if it identifies at
 * least two or more packages that are known to install the same file(s).
 * If a collision occurs and you can not explain where the file came from
 * then you should simply ignore the collision since there is not enough
 * information to determine if a real problem exists. Please do NOT file
 * a bug report at http://bugs.gentoo.org unless you report exactly which
 * two packages install the same file(s). See
 * http://wiki.gentoo.org/wiki/Knowledge_Base:Blockers for tips on how to
 * solve the problem. And once again, please do NOT file a bug report
 * unless you have completely understood the above message.
 * 
 * Detected file collision(s):
 * 
 * 	/usr/lib64/libcc1.la
 * 	/usr/lib64/libcc1.so.0.0.0
 * 	/usr/lib64/libcc1.so.0
 * 	/usr/lib64/libcc1.so
 * 
 * Searching all installed packages for file collisions...
 * 
 * Press Ctrl-C to Stop
 * 
 * cross-i686-pc-linux-gnu/gcc-5.1.0:5.1.0::crossdev
 * 	/usr/lib64/libcc1.la
 * 	/usr/lib64/libcc1.so
 * 	/usr/lib64/libcc1.so.0
 * 	/usr/lib64/libcc1.so.0.0.0
 * 
 * Package 'cross-avr/gcc-5.1.0' NOT merged due to file collisions. If
 * necessary, refer to your elog messages for the whole content of the
 * above message.
 * 
 * Please include /var/tmp/portage/cross-avr/gcc-5.1.0/work/gcc-build-logs.tar.bz2 in your bug report.
 * 

>>> Failed to install cross-avr/gcc-5.1.0, Log file:

>>>  '/var/tmp/portage/cross-avr/gcc-5.1.0/temp/build.log'
 * Messages for package cross-avr/gcc-5.1.0:
 * Failed to set XATTR_PAX markings -re /var/tmp/portage/cross-avr/gcc-5.1.0/image//usr/libexec/gcc/avr/5.1.0/cc1plus.
 * This package will overwrite one or more files that may belong to other
 * packages (see list below). You can use a command such as `portageq
 * owners / <filename>` to identify the installed package that owns a
 * file. If portageq reports that only one package owns a file then do
 * NOT file a bug report. A bug report is only useful if it identifies at
 * least two or more packages that are known to install the same file(s).
 * If a collision occurs and you can not explain where the file came from
 * then you should simply ignore the collision since there is not enough
 * information to determine if a real problem exists. Please do NOT file
 * a bug report at http://bugs.gentoo.org unless you report exactly which
 * two packages install the same file(s). See
 * http://wiki.gentoo.org/wiki/Knowledge_Base:Blockers for tips on how to
 * solve the problem. And once again, please do NOT file a bug report
 * unless you have completely understood the above message.
 * 
 * Detected file collision(s):
 * 
 * 	/usr/lib64/libcc1.la
 * 	/usr/lib64/libcc1.so.0.0.0
 * 	/usr/lib64/libcc1.so.0
 * 	/usr/lib64/libcc1.so
 * 
 * Searching all installed packages for file collisions...
 * 
 * Press Ctrl-C to Stop
 * 
 * cross-i686-pc-linux-gnu/gcc-5.1.0:5.1.0::crossdev
 * 	/usr/lib64/libcc1.la
 * 	/usr/lib64/libcc1.so
 * 	/usr/lib64/libcc1.so.0
 * 	/usr/lib64/libcc1.so.0.0.0
 * 
 * Package 'cross-avr/gcc-5.1.0' NOT merged due to file collisions. If
 * necessary, refer to your elog messages for the whole content of the
 * above message.
 * 
 * Please include /var/tmp/portage/cross-avr/gcc-5.1.0/work/gcc-build-logs.tar.bz2 in your bug report.
 * 



 * GNU info directory index is up-to-date.

 * IMPORTANT: config file '/etc/portage/package.keywords/cross-x86_64-apple-darwin14.5.0' needs updating.

!!! existing preserved libs:
>>> package: dev-libs/libgcrypt-1.6.3-r4
 *  - /usr/lib64/libgcrypt.so.11
 *  - /usr/lib64/libgcrypt.so.11.8.3
 *      used by /usr/bin/gpg-agent (app-crypt/gnupg-2.0.26-r3)
 *      used by /usr/bin/gpg2 (app-crypt/gnupg-2.0.26-r3)
 *      used by /usr/bin/gpgkey2ssh (app-crypt/gnupg-2.0.26-r3)
 *      used by 7 other files
Use emerge @preserved-rebuild to rebuild packages using these libraries
 * See the CONFIGURATION FILES section of the emerge
 * man page to learn how to update config files.

 * IMPORTANT: 1 news items need reading for repository 'gentoo'.
 * Use eselect news read to view new items.