cc -pthread  -Wall -Wextra at_quick_exit.c -o at_quick_exit -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lnetwork -lbsd -latomic
at_quick_exit.c: In function 'main':
at_quick_exit.c:14:14: warning: implicit declaration of function 'at_quick_exit' [-Wimplicit-function-declaration]
   14 |         if ( at_quick_exit(handler) )
      |              ^~~~~~~~~~~~~
at_quick_exit.c:16:9: warning: implicit declaration of function 'quick_exit' [-Wimplicit-function-declaration]
   16 |         quick_exit(1);
      |         ^~~~~~~~~~
/boot/system/develop/tools/bin/../lib/gcc/x86_64-unknown-haiku/13.3.0/../../../../x86_64-unknown-haiku/bin/ld: ../out/haiku/basic/at_quick_exit.o: in function `main':
at_quick_exit.c:(.text+0x8cf): undefined reference to `at_quick_exit'
/boot/system/develop/tools/bin/../lib/gcc/x86_64-unknown-haiku/13.3.0/../../../../x86_64-unknown-haiku/bin/ld: at_quick_exit.c:(.text+0x8fb): undefined reference to `quick_exit'
collect2: error: ld returned 1 exit status