/usr/share/dune/cmake/modules/UsePETSc.cmake is in libdune-pdelab-dev 2.5.0~20170124g7cf9f47a-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | find_package(PETSc)
set(HAVE_PETSC ${PETSC_FOUND})
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