To include MrSID support in qgis when using Slackware 13, you must build gdal from source and include the LizardTech sdk by adding this line to your gdal 'configure' command:

--with-mrsid=/path_to_sdk

in my case:

./configure --with-mrsid=/home/hammack/downloads/Geo_DSDK-7.0.0.2167

Do a 'make' and 'make install' as usual.

At this point typing 'gdal --formats' should give you a list of supported formats which includes:

  MrSID (ro): Multi-resolution Seamless Image Database (MrSID)
  JP2MrSID (ro): MrSID JPEG2000

If this looks okay, rebuild qgis from source and you're finished.

To obtain the LizardTech sdk, go to     http://www.lizardtech.com/developer (registration is necessary) and download     
GeoExpress SDK for Linux (x86) for gcc 4.1, unzip and untar.

You can find some of the packages you'll need to build qgis (but that are missing from Slack 13) at http://gotslack.org/qgis.
 

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