# emerge -avt gcc

 * IMPORTANT: 3 config files in '/etc/portage' need updating.
 * See the CONFIGURATION FILES section of the emerge
 * man page to learn how to update config files.

These are the packages that would be merged, in reverse order:

Calculating dependencies... done!
[ebuild   R   ] sys-devel/gcc-4.5.1  USE="fortran mudflap (multilib) nls nptl openmp (-altivec) -bootstrap -build -doc (-fixed-point) -gcj -graphite -gtk (-hardened) (-libffi) -lto -multislot (-n32) (-n64) -nocxx -nopie -nossp -objc -objc++ -objc-gc -test -vanilla" 0 kB

Total: 1 package (1 reinstall), Size of downloads: 0 kB

Would you like to merge these packages? [Yes/No] No

Quitting.

# gcc --version
gcc (Gentoo 4.4.4-r1 p1.1, pie-0.4.5) 4.4.4
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#