nullhost win # equery u gcc
[ Searching for packages matching gcc... ]
[ Colour Code : set unset ]
[ Legend        : Left column  (U) - USE flags from make.conf                     ]
[                  : Right column (I) - USE flags packages was installed with ]
[ Found these USE variables for sys-devel/gcc-4.1.1 ]
 U I
 - - altivec   : Adds support for optimizations for G4 and G5/ppc970 processors
 - - bootstrap : !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during original system bootstrapping
 - - build     : !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping.
 + - doc       : Adds extra documentation (API, Javadoc, etc)
 + + fortran   : Adds support for fortran (formally f77)
 - - gcj       : Enable building with gcj (The GNU Compiler for the Javatm Programming Language)
 + - gtk       : Adds support for x11-libs/gtk+ (The GIMP Toolkit)
 - - hardened  : activate default security enhancements for toolchain (gcc, glibc, binutils)
 - - ip28      : Enable building a compiler capable of building a kernel for SGI Indigo2 Impact R10000 (IP28)
 - - ip32r10k  : Enable building a compiler capable of building an experimental kernel for SGI O2 w/ R1x000 CPUs (IP32)
 - - mudflap   : Add support for mudflap, a pointer use checking library
 - - multilib  : On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
 - - multislot : Allow for SLOTs to include minor version (3.3.4 instead of just 3.3)
 - - n32       : Enable n32 ABI support on mips
 - - n64       : Enable n64 ABI support on mips
 + + nls       : Adds Native Language Support (using gettext - GNU locale utilities)
 - - nocxx     : Disable support for C++ (DON'T USE THIS UNLESS YOU KNOW WHAT YOU'RE DOING)
 - - objc      : Build support for the Objective C code language
 - - objc++    : Build support for the Objective C++ language
 - - objc-gc   : Build support for the Objective C code language Garbage Collector
 - - vanilla   : Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically