media-gfx/enblend-4.1.1 does not support EXR files, even with USE="openexr" set. Checking the supported file formats with "enblend -v -V" does not list EXR as a supported format, even though enblend is installed with USE="openexr". Installing media-libs/vigra with USE="openexr" solved the problem. Adding a use dependency on media-libs/vigra[openexr] should therefore be enough. Looking at the other enblend ebuilds, this seems to affect all of the enblend ebuilds in Portage, even if the openexr USE flag was removed in versions >4.1.1. It is worth mentioning that I stumbled upon this issue when using hugin. During my search on the net, I discovered someone who ran into the same error when hugin tried to create an EXF file: https://bugs.launchpad.net/enblend/+bug/1169204 Reproducible: Always
Fixed in cvs, thanks for the report and solution! + 25 Jul 2015; Markus Meier <maekke@gentoo.org> enblend-4.1.3.ebuild: + depend on media-libs/vigra[openexr] by Michael Seifert in bug #555716 +