KRB5_ENV_CCNAME
env_ccname = getenv(KRB5_ENV_CCNAME);
if (set_env_var(KRB5_ENV_CCNAME, ccname)) {
KRB5_ENV_CCNAME);
unsetenv(KRB5_ENV_CCNAME);
GetEnvironmentVariable(KRB5_ENV_CCNAME, name_buf, name_size);
envstr = secure_getenv(KRB5_ENV_CCNAME);