[Tile-serving] [osm2pgsql] "Targets may link only to libraries." (#531)

[@emergentcity]

When installing to Mac El Capitan 10.11.3:

The default installation finds the system geos framework but when I try to override this by editing `CMakeCache.txt` to my macports version then I get a list of errors to this effect:
```
Target "osm2pgsql" requests linking to directory "/opt/local/include/geos".  Targets may link only to libraries.  CMake is dropping the item.
```
Any ideas for what is wrong or how to get cmake to accept the macports geos?

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/531
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