## OCC Environment Variables


OCC understands several environment variables.

|Variable |Usage |
|--- |--- |
|CCINCL |Add something to include path |
|CPATH |Add something to end of include path |
|OCC_LEGACY_OPTIONS|use old-style command line parsing |
|ORANGEC |Path to root of compiler installation |
|SOURCE_DATE_EPOCH |sets a time_t value to force the __DATE__ and __TIME_ macros to a constant value|