2010/6/9 Luís de Sousa <luis.a.de.so...@gmail.com>:
> template_postgis=# UPDATE spatial_ref_sys
> template_postgis-# SET proj4text = '+proj=tmerc
> +lat_0=39.66666666666666 +lon_0=1 +k=1 +x_0=0 +y_0=0 +ellps=intl
> +pm=lisbon +units=m +no_defs +nadgrids=ptLX_e89.gsb'
> template_postgis-# WHERE srid = 20791;

The file name "ptLX_e89.gsb" is case sensitive on *nix systems. Is
your file mixed case, all upper or all lower case?

-Mike
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