This is a sample implementation of require of mruby.

Prepare sample files as follows:

# test.rb

class Test
  Const = "const"
end

# main.rb

require("test")

p Test::Const

Compile these files to binary files with mrbc.
Do not forget to use -B option, not -C.

% mrbc -Bdata_test test.rb
% mrbc -Bdata_main main.rb

Variable name should be set to data_#{filename}, so filename should not include an invalid character for C variable name, such as "-".

Now you have test.c and main.c.

Compile these files and link them when you build your own mruby's application.
For example, prepare the following file:

/* sample.c */
#include <stdio.h>

#include <mruby.h>
#include <mruby/dump.h>
#include <mruby/proc.h>
#include <mruby_require.h>

extern const char data_main[];

int
main(int argc, char **argv)
{
  mrb_state *mrb = mrb_open();
  int n = -1;

  if (mrb == NULL) {
    fprintf(stderr, "Invalid mrb_state, exiting mruby");
    return EXIT_FAILURE;
  }

  mrb_init_kernel_require(mrb);  /* initialize this library */

  n = mrb_read_irep(mrb, data_main);
  mrb_run(mrb, mrb_proc_new(mrb, mrb->irep[n]), mrb_top_self(mrb));
  mrb_close(mrb);

  return EXIT_SUCCESS;
}

Do not forget to call mrb_init_kernel_require.

Compile this file and link with libmruby_require.a, libmruby.a, libmruby_core.a, test.o, main.o.