#define J40_IMPLEMENTATION // only a SINGLE file should have this #include "j40.h" // you also need to define a macro for experimental versions; follow the error. #include <stdio.h> #include <stdarg.h> // for va_* static int oops(const char *fmt, ...) { va_list args; va_start(args, fmt); vfprintf(stderr, fmt, args); va_end(args); return 1; } int main(int argc, char **argv) { if (argc < 3) return o