cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration string/strcoll_l.c -o string/strcoll_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
string/strcoll_l.c:15:19: error: call to undeclared function 'strcoll_l'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   15 |         int comparison = strcoll_l(a, b, locale);
      |                          ^
string/strcoll_l.c:15:19: note: did you mean 'strcoll'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_string.h:90:6: note: 'strcoll' declared here
   90 | int      strcoll(const char *__s1, const char *__s2);
      |          ^
1 error generated.