cc -O2 -pipe -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/wcscasecmp_l.c -o wchar/wcscasecmp_l -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lstdthreads -lcrypt
ld: error: undefined symbol: wcscasecmp_l
>>> referenced by wcscasecmp_l.c
>>>               ../out/freebsd/basic/wchar/wcscasecmp_l.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)