backend_sources += files(
  'gist.c',
  'gistbuild.c',
  'gistbuildbuffers.c',
  'gistget.c',
  'gistproc.c',
  'gistscan.c',
  'gistsplit.c',
  'gistutil.c',
  'gistvacuum.c',
  'gistvalidate.c',
  'gistxlog.c',
)