sys-cluster/mpe2-1.3.0 was released on 2010-10-25. HOMEPAGE should be updated. I suggest: HOMEPAGE="http://www.mcs.anl.gov/research/projects/perfvis/software/MPE/ http://www.mcs.anl.gov/research/projects/perfvis/download/" If possible, please enable building of shared libraries. (sys-cluster/mpe2-1.0.6_p1-r1 installs only static libraries.)
sys-cluster/mpe2-2.4.8 was released on 2015-08-26. sys-cluster/mpe2-2.4.9b was released on 2015-12-02.