This file is indexed.

/usr/lib/x86_64-linux-gnu/cmake/dune-grid/dune-grid-config-version.cmake is in libdune-grid-dev 2.5.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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set(PACKAGE_VERSION "2.5.1")

if("${PACKAGE_FIND_VERSION_MAJOR}" EQUAL "2" AND
     "${PACKAGE_FIND_VERSION_MINOR}" EQUAL "5")
  set (PACKAGE_VERSION_COMPATIBLE 1) # compatible with newer
  if ("${PACKAGE_FIND_VERSION}" VERSION_EQUAL "2.5.1")
    set(PACKAGE_VERSION_EXACT 1) #exact match for this version
  endif()
endif()