cc -O2 -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations strings/ffsll.c -o strings/ffsll -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lintl -lcrypt
strings/ffsll.c:11:25: error: 'ffsll' undeclared here (not in a function); did you mean 'ffs'?
   11 | int (*foo)(long long) = ffsll;
      |                         ^~~~~
      |                         ffs