Gentoo's Bugzilla –
Attachment 527134 Details for
Bug 652962media-libs/openimageio-1.8.7 USE="opengl qt5" - In file included from .../work/openimageio-1.8.7/src/iv/imageviewer.cpp:38: /usr/include/GLES3/gl31.h:528:60: error: 'void __glewActiveTexture(GLenum)' redeclared as different kind of symbol