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CentOS 7.0 - man page for fcgetdefaultlangs (centos section 3)

FcGetDefaultLangs(3)													      FcGetDefaultLangs(3)

FcGetDefaultLangs - Get the default languages list
#include <fontconfig/fontconfig.h> FcStrSet * FcGetDefaultLangs (voidls);
Returns a string set of the default languages according to the environment variables on the system. This function looks for them in order of FC_LANG, LC_ALL, LC_CTYPE and LANG then. If there are no valid values in those environment variables, "en" will be set as fallback.
Fontconfig version 2.10.95 31 8 2013 FcGetDefaultLangs(3)