cc -O2 -pipe  -pthread -I/usr/local/include  -Wall -Wextra -Werror=implicit-function-declaration iconv/iconv.c -o iconv/iconv -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -L/usr/local/lib  -lintl
ld: error: undefined symbol: libiconv_open
>>> referenced by iconv.c
>>>               ../out/openbsd/basic/iconv/iconv.o:(main)

ld: error: undefined symbol: libiconv
>>> referenced by iconv.c
>>>               ../out/openbsd/basic/iconv/iconv.o:(main)
>>> referenced by iconv.c
>>>               ../out/openbsd/basic/iconv/iconv.o:(main)
>>> referenced by iconv.c
>>>               ../out/openbsd/basic/iconv/iconv.o:(main)
>>> referenced 1 more times
cc: error: linker command failed with exit code 1 (use -v to see invocation)