The LC_xxxx variables are not used by DB-Library.
Open Client and Open Server products use these environment variables during localization:
LC_ALL
LC_COLLATE
LC_TYPE
LC_MESSAGE
LC_TIME
The localization environment variables are POSIX standard environment variables and can be used by non-Sybase applications.
Some non-Sybase applications can use the same localization-related environment variable as your Open Client and Open Server application. Make sure that locales.dat lists the same locale names as are used by the environment variables of the non-Sybase applications.