PETSC_ARCH and missing "/conf/PETScConfig.cmake")

[python152]

hi -

I am compiling a software (gridpack) which depends on petsc. spack install petsc installs fine, but doesn't seem to have PETSC_ARCH set. The following messages suggests it is expecting another file: "${PETSC_DIR}/${PETSC_ARCH}/conf/PETScConfig.cmake")

that I am not sure of its origin ... is there anything I am missing here?

Thanks

-- Checking PETSc ...
CMake Error at /home/ubuntu/GridPACK/cmake-jedbrown/FindPETSc.cmake:151 (message):
  The pair
  PETSC_DIR=/home/ubuntu/spack/opt/spack/linux-ubuntu20.04-haswell/gcc-9.3.0/petsc-3.13.4-2bjevskgval6putbionc5ehmxeidsvnn
  PETSC_ARCH= do not specify a valid PETSc installation
Call Stack (most recent call first):
  CMakeLists.txt:280 (find_package)


-- Using PETSc version 3.13.4
CMake Error at CMakeLists.txt:290 (message):
  PETSc found, but CMake configuration for PETSc installation not found?

[jedbrown]

Since you're using a recent version of PETSc, I strongly recommend using [FindPkgConfig.cmake](https://cmake.org/cmake/help/latest/module/FindPkgConfig.html) to make use of the petsc.pc that is now included with PETSc. Patches welcome, but I don't use CMake for any of my current projects and unfortunately don't have time to support these modules.