update README

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 Portage overlay aimed to fix some ebuilds from `sci-electronics` and `sci-mathematics` and eventually make an OpenROAD ebuild.
 
 Portage overlay aimed to fix some ebuilds from `sci-electronics` and `sci-mathematics` and eventually make an OpenROAD ebuild.
 

+Ebuild files taken from the official Gentoo repository.
+

 ## Currently available:
 ## Currently available:

-* sci-electronics/magic
-* sci-mathematics/cudd
+* `dev-libs/boost` & `dev-libs/boost-static` - a hacky way to get static Boost libraries using a second ebuild, not all USE flags are tested!
+* `sci-electronics/magic` - updated to a newer version and set `-std=gnu89` permanently, used to fail to compile because of `termio.h` and old-style function declarations mixed with C99-style comments.
+* `sci-mathematics/cudd` - building documentation fails with a modern C++ compiler, this ebuild just skips the docs.