getting rgeo to work with geos 3.3.3

[Andy]

Hi Folks,

I'm attempting to setup rgeo on Ubuntu 12.04.  I'm using geos, gdal, proj out of

a personal pacakage repo called ubuntugis:

https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable

When running some code, I found that RGeo is not seeing geos:

From within rails console:

irb(main):004:0> RGeo::Geos.supported?

=> false

When I went a hunting down why, I found myself in the 

rgeo gem sources under rgeo-0.3.20/ext/geos_c_impl

I ran ruby extconf.rb to get:

checking for geos_c.h... yes

checking for GEOSSetSRID_r() in geos_c.h... no

checking for GEOSPreparedContains_r() in geos_c.h... no

checking for GEOSPreparedDisjoint_r() in geos_c.h... no

checking for GEOSWKTWriter_setOutputDimension_r() in geos_c.h... no

checking for rb_memhash() in ruby.h... yes

**** WARNING: Unable to find GEOS headers or GEOS version is too old.

**** Compiling without GEOS support.

creating Makefile

When I go hunting in the make file for the functions that are not found they all seem to be there.

Any pointers that might help me out of this?

Thanks in advance.

[Andy]

Figured this one out.  Turns out there was no link from libgeos.so to libgeos-3.3.3.so

Once I got this in place we're good.

[Gilberto Paulo Carmo]

Yep. I also have the same issue but with libgeos-3.3.8.so

I am using rvm and ruby-2.0.0.

I had to manually remove the gem rgeo-0.3.20 inside .rvm/gems/ruby-2.0.0-pXXX/gems (you could also do a "gem uninstall rgeo"

then create the sym link inside /usr/lib "ln -s libgeos-3.3.8.so libgeos.so"

and then "gem install rgeo"  again

It worked.