These are the packages that would be merged, in order:

Calculating dependencies ...

!!! Problem resolving dependencies for =sci-libs/mathgl-8.0.3
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=sci-libs/mathgl-8.0.3" has unmet requirements.
- sci-libs/mathgl-8.0.3::gentoo USE="gif jpeg opengl openmp png threads zlib -doc -fltk -glut -gsl -hdf -hdf5 -mpi (-octave) -pdf -qt6 -wxwidgets" L10N="-ru"

  The following REQUIRED_USE flag constraints are unsatisfied:
    openmp? ( !threads )

  The above constraints are a subset of the following complete expression:
    mpi? ( hdf5 ) openmp? ( !threads ) png? ( zlib ) pdf? ( png )