| ARG_MAX | Max number of command-line arguments. | 
| NAME_MAX | Max length (in bytes) of filename | 
| PATH_MAX | Max length (in bytes) of pathname | 
| Prio_PGrp | #rtl.baseunix.fpGetPriority  option: Get process group priority. | 
| Prio_Process | #rtl.baseunix.fpGetPriority  option: Get process priority. | 
| Prio_User | #rtl.baseunix.fpGetPriority  option: Get user priority. | 
| pthreadrwlocksize | Size of pthread_rwlock_t _data structure | 
| SIG_MAXSIG | Maximum signal number. | 
| SYS_NMLN | Max system namelength | 
| _PTHREAD_MUTEX_ADAPTIVE_NP | Mutex options: | 
| _PTHREAD_MUTEX_DEFAULT | Mutex options: | 
| _PTHREAD_MUTEX_ERRORCHECK | Mutex options: | 
| _PTHREAD_MUTEX_ERRORCHECK_NP | Mutex options: double lock returns an error code. | 
| _PTHREAD_MUTEX_FAST_NP | Mutex options: Fast mutex | 
| _PTHREAD_MUTEX_NORMAL | Mutex options: | 
| _PTHREAD_MUTEX_RECURSIVE | Mutex options: | 
| _PTHREAD_MUTEX_RECURSIVE_NP | Mutex options: recursive mutex | 
| _PTHREAD_MUTEX_TIMED_NP | Mutex options: ? |