OLD_ENV_VAR
if (old_env_var == OLD_ENV_VAR)
old_env_value = OLD_ENV_VAR;
old_env_var = OLD_ENV_VAR;
old_env_value = OLD_ENV_VAR;
int old_env_var = OLD_ENV_VAR;
#define old_env_var OLD_ENV_VAR
case OLD_ENV_VAR:
old_env_var = OLD_ENV_VAR;
if (old_env_value == OLD_ENV_VAR)