[gdal-dev] Problem building GDAL with GEOS on Cygwin

[Roberto Ribeiro]

Hello list, I'm trying to build GDAL 2.3 on Cygwin, and have been running
amok with the GEOS option. I present the correct path for the geos_config
file during ./configure, it does not throw any error, but after
configuration is done, GEOS support is marked as "no". And, sure enough,
while the script runs:

    libwebp not found - WEBP support disabled
    checking for bin... no
    checking for sfcgal-config... no

This shows that it did find the file, else it'd show "checking for
geos-config", but it's not finding the bin dir (which is the same one where
geos_config is). How might I fix this?

P.S.: it's GEOS 3.6.3, compiled with cygwin, working.
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