How are you able to compile libraries as "-dev" (i.e. libboost-devel)
 

Basically the question above, but on Sabayon's Portage (GUI of emerge for gentoo) it will not allow me to compile that package, so here comes the manual way. Thx in advance!
:Pengy:

WHAT are you trying to do?

On Gentoo as on Sabayon the cathegory/name of the ebuild is: dev-libs/boost
Libraries are normally not build for "themselves" - they are rather a requisite/dependency for some program - and are built when some program requires it.
What I mean - you normally don't do:
emerge dev-libs/boost
You "emerge" some program - if it needs "boost" - "dev-libs/boost" is built first "automatically".

HTH

Well yeah.. but
 

the thing is that I'm trying to compile a modified version of stellarium and it needs libboost-dev to be able to run or compile