cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration monetary/strfmon.c -o monetary/strfmon -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
monetary/strfmon.c:3:10: fatal error: monetary.h: No such file or directory
    3 | #include <monetary.h>
      |          ^~~~~~~~~~~~
compilation terminated.