In the following steps we assume that [PETSC](https://www.mcs.anl.gov/petsc/) (version 3.4 or more recent) has been installed with CDMATH with the process described above.
You need to set the following variables
-- `CDMATH_INSTALL`, the path to your CDMATH installation, for example `~/workspace/cdmath/cdmath_install//share/petsc-3.14.2 `
+- `CDMATH_INSTALL`, the path to your CDMATH installation, for example `~/workspace/cdmath/cdmath_install//share/petsc-3.15.0 `
- `PETSC_DIR`, the path to your PETSc installation. If [PETSC](https://www.mcs.anl.gov/petsc/) was installed by CDMATH then [CDMATH-Toolbox](https://github.com/ndjinga/CDMATH) can be defined as `~/workspace/cdmath/cdmath_install`
- `PETSC_ARCH`, the type of installation used (usually arch-linux2-c-opt or linux-gnu-c-opt)
