cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/nice.c -o unistd/nice -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
unistd/nice.c:11:19: error: ‘nice’ undeclared here (not in a function)
   11 | int (*foo)(int) = nice;
      |                   ^~~~