cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration locale/getlocalename_l.c -o locale/getlocalename_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
locale/getlocalename_l.c:9:21: error: call to undeclared function 'getlocalename_l'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    9 |         const char* name = getlocalename_l(LC_COLLATE, LC_GLOBAL_LOCALE);
      |                            ^
locale/getlocalename_l.c:9:14: error: incompatible integer to pointer conversion initializing 'const char *' with an expression of type 'int' [-Wint-conversion]
    9 |         const char* name = getlocalename_l(LC_COLLATE, LC_GLOBAL_LOCALE);
      |                     ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
locale/getlocalename_l.c:17:7: error: incompatible integer to pointer conversion assigning to 'const char *' from 'int' [-Wint-conversion]
   17 |         name = getlocalename_l(LC_COLLATE, locale);
      |              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 errors generated.