This file is indexed.

/usr/lib/x86_64-linux-gnu/cmake/XdmfCMake/XDMFBuildSettings.cmake is in libxdmf-dev 2.1.dfsg.1-11+b2.

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# The command CMAKE_EXPORT_BUILD_SETTINGS(...) was used by
# Xdmf to generate this file.  As of CMake 2.8 the
# functionality of this command has been dropped as it was deemed
# harmful (confusing users by changing their compiler).

# CMake 2.6 and below do not support loading their equivalent of this
# file if it was produced by a newer version of CMake.  CMake 2.8 and
# above simply do not load this file.  Therefore we simply error out.
message(FATAL_ERROR
  "This Xdmf was built by CMake 2.8.12.2, but this is CMake "
  "${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}.${CMAKE_PATCH_VERSION}.  "
  "Please upgrade CMake to a more recent version.")