* sys-devel/gcc
    gentoo:            (2.95.3-r9)K (2.95.3-r10)K {:2.95} (3.1.1-r2)K {:3.1} (3.2.2)K (3.2.3-r4)K {:3.2} (3.3.2-r7)K (3.3.5-r1)K (3.3.5.20050130-r1)K (3.3.6)K (3.3.6-r1)K {:3.3} (3.4.1-r3)K 3.4.4-r1 3.4.5 (3.4.5-r1)K (3.4.6)K 3.4.6-r1 3.4.6-r2 {:3.4} (4.0.3)K (4.0.4)K {:4.0} (4.1.0-r1)K 4.1.1 4.1.1-r1 4.1.1-r3 4.1.2 {:4.1} 
    installed:         3.4.6-r2 {:x86_64-pc-linux-gnu-3.4.6} 4.1.1-r3 {:x86_64-pc-linux-gnu-4.1.1} 4.1.2* {:x86_64-pc-linux-gnu-4.1.2} 
    Homepage:          http://gcc.gnu.org/
    Description:       The GNU Compiler Collection. Includes C/C++, java compilers, pie+ssp extensions, Haj Ten Brugge runtime bounds checking
    License:           ( GPL-2 LGPL-2.1 ) 
    Source origin:     sys-devel/gcc-4.1.2::gentoo
    Installed time:    Sat Mar 31 19:04:43 2007
    Use flags:         (-altivec) (-bootstrap) (-build) (-d) (-doc) (-fortran) (-gcj) (-gtk) (-hardened) (-ip28) (-ip32r10k) (-mudflap) (-multilib) (multislot) (-n32) (-n64) (nls) (-nocxx) (-objc) (-objc++) (-objc-gc) (-test) (-vanilla)


Key to mask reasons:

* K: keyword