[postgis-devel] PROJ 6.0.0 !!

[Greg Troxel]

I have an update to proj 6 in pkgsrc (not yet pushed because it breaks
some things), and am rebuilding things that depend on proj.  postgis is
at 2.5.1 and says:

  checking proj_api.h usability... no
  checking proj_api.h presence... no
  checking for proj_api.h... no
  configure: error: could not find proj_api.h - you may need to specify the directory of a PROJ.4 installation using --with-projdir
  *** Error code 1

which is mostly  unsurprising given

  https://github.com/OSGeo/proj.4/issues/836


As I understand it, 2.5.1 is the most recent actual release.

I am unclear on the game of declaring deprecated API usage; it is not
helpful for me to do that as a packager, since that's basically just
undoing what proj did, and it seems necessary for depending packages to
adapt before the next proj release.

I don't find either 1) not using proj_ahi.h or 2) defining the workaround
listed at

  https://trac.osgeo.org/postgis/query?status=assigned&status=new&status=reopened&group=status&milestone=PostGIS+2.5.2

I am curious as to thoughts/plans.  I can file tickets if that's
helpful.  Perhaps a workaround for 2.5, and a real fix for trunk unless
it's fixed already.