System requirements: PROJ (>= 4.8.0, https://proj.org/download.html) and
GDAL (>= 1.11.4, https://gdal.org/download.html), with versions
either (A) PROJ < 6 and GDAL < 3 or (B) PROJ >= 6 and GDAL >=
3. For degraded PROJ 6 or 7 and GDAL < 3, use the configure
argument '--with-proj_api="proj_api.h"'.