cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration sys_mman/munlock.c -o sys_mman/munlock -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
sys_mman/munlock.c: In function ‘main’:
sys_mman/munlock.c:17:14: error: implicit declaration of function ‘mlock’ [-Wimplicit-function-declaration]
   17 |         if ( mlock(page, pagesize) < 0 )
      |              ^~~~~
sys_mman/munlock.c:23:14: error: implicit declaration of function ‘munlock’ [-Wimplicit-function-declaration]
   23 |         if ( munlock(page, pagesize) < 0 )
      |              ^~~~~~~