cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration sys_mman/munlockall.c -o sys_mman/munlockall -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
sys_mman/munlockall.c: In function ‘main’:
sys_mman/munlockall.c:10:14: error: implicit declaration of function ‘mlockall’ [-Wimplicit-function-declaration]
   10 |         if ( mlockall(MCL_CURRENT | MCL_FUTURE) < 0 )
      |              ^~~~~~~~
sys_mman/munlockall.c:10:23: error: ‘MCL_CURRENT’ undeclared (first use in this function)
   10 |         if ( mlockall(MCL_CURRENT | MCL_FUTURE) < 0 )
      |                       ^~~~~~~~~~~
sys_mman/munlockall.c:10:23: note: each undeclared identifier is reported only once for each function it appears in
sys_mman/munlockall.c:10:37: error: ‘MCL_FUTURE’ undeclared (first use in this function)
   10 |         if ( mlockall(MCL_CURRENT | MCL_FUTURE) < 0 )
      |                                     ^~~~~~~~~~
sys_mman/munlockall.c:16:14: error: implicit declaration of function ‘munlockall’; did you mean ‘unlockpt’? [-Wimplicit-function-declaration]
   16 |         if ( munlockall() < 0 )
      |              ^~~~~~~~~~
      |              unlockpt