cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration time/strftime_l.c -o time/strftime_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
time/strftime_l.c:24:18: error: call to undeclared function 'strftime_l'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   24 |         size_t length = strftime_l(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", &tm, loc);
      |                         ^
time/strftime_l.c:24:18: note: did you mean 'strftime'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_time.h:119:8: note: 'strftime' declared here
  119 | size_t strftime(char *_LIBC_COUNT(__maxsize) __restrict, size_t __maxsize, const char * __restrict, const struct tm * __restrict) __DARWIN_ALIAS(strftime);
      |        ^
1 error generated.