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If you have problems loading qtvisual on Linux, especially versions that are a bit older, check the version of fontconfig that is installed. Qt requires version 2.4.2 or greater.
To check your version, look at fontconfig.h on your system and find the macros FC_MAJOR, FC_MINOR and FC_REVISION. The version number FC_MAJOR . FC_MINOR . FC_REVISION should be >= 2.4.2, or else you need to install a more recent version.
Also make sure that the LD_LIBRARY_PATH environment variable includes the location of the required fontconfig library (e.g., /opt/fontconfig-2.6.0/lib).
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