I can't find a pre-compiled binary on the site. So I tried to build one myself.

I'm getting the following errors:

Code
Undefined symbols:
  "_png_read_bitmap", referenced from:
      _main in png2bdc.o
  "_bitmap_free", referenced from:
      _main in png2bdc.o
      _main in png2bdc.o
  "_core_fopen", referenced from:
      _main in png2bdc.o
      _main in png2bdc.o
  "_core_fclose", referenced from:
      _main in png2bdc.o
      _main in png2bdc.o
      _main in png2bdc.o
  "_core_fseek", referenced from:
      _main in png2bdc.o
  "_bitmap_alloc", referenced from:
      _main in png2bdc.o
  "_core_fwrite", referenced from:
      _main in png2bdc.o
      _main in png2bdc.o
      _main in png2bdc.o
      _main in png2bdc.o

/Applications/MAME/Source/mameosx/mame/src/emu/rendfont.c:16:22: error: uismall.fh: No such file or directory
/Applications/MAME/Source/mameosx/mame/src/emu/rendfont.c: In function 'render_font_alloc':
/Applications/MAME/Source/mameosx/mame/src/emu/rendfont.c:155: error: 'font_uismall' undeclared (first use in this function)
/Applications/MAME/Source/mameosx/mame/src/emu/rendfont.c:155: error: (Each undeclared identifier is reported only once
/Applications/MAME/Source/mameosx/mame/src/emu/rendfont.c:155: error: for each function it appears in.)