postinstall could open "you need to XX next" file/url

[maphew]

To help people with the scenario below the ECW, MrSid and similar packages which can't be shipped complete could open up a file or url explaining what people need to next to complete the install.

((​http://lists.osgeo.org/pipermail/gdal-dev/2009-October/022454.html))

One thing I am currently missing in OSGeo4W GDAL is support for ECW and

MrSID -- is it available? I've installed the gdal-ecw and gdal-mrsid packages, but it seems I am missing the DLLs. E.g. when I try "gdalinfo --formats" I get complaints: ERROR 1: Can't load requested DLL: C:\OSGeo4W\apps\gdal-16\bin\gdalplugins\gdal_ECW_JP2ECW.dll 126: The specified module could not be found.

ERROR 1: Can't load requested DLL: C:\OSGeo4W\apps\gdal-16\bin\gdalplugins\gdal_MrSID.dll 126: The specified module could not be found.

Have tried this with both gdal-* and gdal16-* packages. And remembered to run gdal16.bat to activate the GDAL 1.6 environment. However, can't get ECW and MrSID support.

I suspect this is due to licensing issues. Do I need to install support for these formats separately?

Yes, you need to get the SDKs from Erdas and Lizartech.

See the GDAL supported format list for information:

​http://www.gdal.org/formats_list.html

Aleksey,

I would add that the OSGeo4W package pages for these packages have additional details:

http://trac.osgeo.org/osgeo4w/wiki/pkg-gdal-mrsid http://trac.osgeo.org/osgeo4w/wiki/pkg-gdal-ecw

[jef]

pkg-gdal-mrsid includes the dependency now. pkg-gdal-ecw is marked obsolete pkg-gdal-filegdb also includes the dependency.

pkg-libjpeg-ipp is also needs dependencies (is it obsolete?) pkg-gdal-sde90 pkg-gdal-sde91 pkg-gdal-sde92 require dependencies too and still need to rebuilt for GDAL 1.9.2.