CalculiX is composed of two parts: a number crunching program (ccx) and a
graphical interface (cgx).
Both are actually independent packages with different requirements: ccx
uses many math-intensive libraries and cgx uses OpenGL.
Building the bundle together forces building cgx with GCC which forces the
use of libstdc++ and as of lately is causing nasty segmentation faults.
ccx is now a run dependency to cgx, which keeps the same functionality of
the previous package.
PR: 220433, 220434