These ebuilds come from http://overlays.gentoo.org/proj/science/wiki/en.
If you have some problems, go to the official site first.
VampirTrace : An open source library that allows detailed logging of program execution for parallel applications ( http://www.tu-dresden.de/die_tu_dresden/zentrale_einrichtungen/zih/forschung/software_werkzeuge_zur_unterstuetzung_von_programmierung_und_optimierung/vampirtrace )
amdapp : AMD Accelerated Parallel Processing (APP) SDK ( http://developer.amd.com/tools/heterogeneous-computing/amd-accelerated-parallel-processing-app-sdk" einfo "${ARCHIVE} from ${HOMEPAGE} )
ccache : fast compiler cache ( http://ccache.samba.org/ )
f90cache : a compiler cache for fortran ( http://people.irisa.fr/Edouard.Canot/f90cache/ )
ndiff : A diff program that ignores small numeric differences ( http://www.math.utah.edu/~beebe/software/ndiff/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a science
For Paludis use this rsync : rsync://gentoo.zugaina.org/science-portage
If you have a problem : ycarus(-at-)zugaina.org