hmixc.h
#if defined O_consthmix
# if defined O_anisotropic_viscosity
# else
# endif
# if defined O_bryan_lewis_horizontal
# else
# endif
#else
# if defined O_smagnlmix
# endif
#endif
#if defined O_consthmix
# if defined O_anisotropic_viscosity
# else
# endif
# if defined O_bryan_lewis_horizontal
# else
# endif
#else
# if defined O_smagnlmix
# endif
#endif