cc -pipe -O   -pthread  -Wall -Wextra getlocalename_l.c -o getlocalename_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lrt -lcrypt
getlocalename_l.c: In function 'main':
getlocalename_l.c:9:21: warning: implicit declaration of function 'getlocalename_l'; did you mean 'setlocale'? [-Wimplicit-function-declaration]
  const char* name = getlocalename_l(LC_COLLATE, LC_GLOBAL_LOCALE);
                     ^~~~~~~~~~~~~~~
                     setlocale
getlocalename_l.c:9:21: warning: initialization of 'const char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
getlocalename_l.c:17:7: warning: assignment to 'const char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  name = getlocalename_l(LC_COLLATE, locale);
       ^
../out/dragonfly/basic/getlocalename_l.o:getlocalename_l.c:function main: error: undefined reference to 'getlocalename_l'
../out/dragonfly/basic/getlocalename_l.o:getlocalename_l.c:function main: error: undefined reference to 'getlocalename_l'
collect2: error: ld returned 1 exit status