You will need the following packages:
ogre
boost (needs the python use flag)
bullet
openal
freealut
libogg
libvorbis
zlib
libpng
ois
subversion
Some of these may already be installed and you may not need to emerge all of these.
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emerge ogre boost bullet openal freealut libogg libvorbis zlib libpng ois subversion -a
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eselect python list
eselect python set x (replace with the number from the above list)
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svn co http://svn.code.sf.net/p/freeorion/code/trunk/FreeOrion/ freeorion
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cd freeorion
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cmake .
make
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./freeorion
No guarantees, but it worked for me anyways thought it might help someone else out.