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Supporting ICU 4.2 seems useful because it ships with CentOS 6. Versions before ICU 4.6 don't support pkg-config, so document an installation method without using pkg-config. In ICU 4.2, ucol_getKeywordsForLocale() sometimes returns values that will not be accepted by uloc_toLanguageTag(). Skip loading keyword variants in that version. Reported-by: Victor Wagner <vitus@wagner.pp.ru>