cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/getpgrp.c -o unistd/getpgrp -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/getpgrp.c:5:22: error: ‘getpgrp’ undeclared here (not in a function); did you mean ‘tcgetpgrp’?
    5 | pid_t (*foo)(void) = getpgrp;
      |                      ^~~~~~~
      |                      tcgetpgrp