i just installed projectm-jack but it fails to run because it expects that /usr/share/projectM/fonts/Vera.ttf exists. when checking libprojectm sources, i found Vera.ttf exists there. anyway it seems that the upstream install script is broken because during install there is this output: ... -- Installing: /var/tmp/portage/media-libs/libprojectm-2.1.0/image/usr/share/projectM/fonts/VeraMono.ttf -- Up-to-date: /var/tmp/portage/media-libs/libprojectm-2.1.0/image/usr/share/projectM/fonts/VeraMono.ttf ... so it seems to me that there is a typo which tries to install VeraMono.ttf twice but in one case it should be Vera.ttf instead.
Fixed in main tree, thanks for the report.