[postgis-devel] Using pkg-config for PROJ

[Raúl Marín Rodríguez]

Hi,

I started doing it in https://github.com/postgis/postgis/pull/372.
Then I noticed that `json-c` had the same option (and we weren't
including its files correctly) and, after that, that the same happens
with `libpcre` and `cunit`.

Wouldn't it make more sense to drop those 4 options (`--with-projdir`,
`--with-jsondir`, etc) and make pkg-config mandatory instead? My only
concern is Windows, which I don't really know if it can use it.

-- 
Raúl Marín Rodríguez
carto.com