Satish, thank you very much for your prompt answers. Your last one, however, does not solve my problem.
PETSC_ARCH='' is not the solution.
Line 115 of FindPETSc.cmake,
if (EXISTS "${PETSC_DIR}/${PETSC_ARCH}/lib/petsc/conf/petscvariables") # > 3.5
would then search for
${PETSC_DIR}//lib/petsc/conf/petscvariables
which obviously fails.
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