[PostGIS] #5764: PostGIS make install fails when building against meson-built PostgreSQL

[PostGIS]

#5764: PostGIS make install fails when building against meson-built PostgreSQL
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  Reporter:  robe     |      Owner:  strk
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.5.0
 Component:  install  |    Version:  master
Resolution:           |   Keywords:
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Comment (by robe):

 I think I narrowed it down to inherited from PGXS


 {{{
 INSTALL
 INSTALL_DATA
 }}}

 Playing around with overriding these to see if I can get it to work for
 both autoconf and meson built postgresql.

 There is a comment that we have PGXS to get these variables, which begs
 the question if we override these, do we need PGXS at all?
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5764#comment:7>
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