New comment by joshuakraemer on void-packages repository https://github.com/void-linux/void-packages/pull/31990#issuecomment-881520796 Comment: @q66, thank you for your comments. I have moved `-DNDEBUG` to the beginning. What do you mean regarding `FFLAGS`? `-DNDEBUG` is not used with Fortran, and CMake does not add anything else to `FFLAGS` (see https://github.com/Kitware/CMake/blob/master/Modules/Compiler/GNU-Fortran.cmake#L20).