lr-dosbox compilation error

Race

Good day.
English is not my native language, so I try explain how I can.
I have Raspberry PI3 B+, Retropie 4.4 official image. And try to install lr-dosbox from retropie-setup. Package not installing with this error:

libretro/libretro.cpp: In function ‘void retro_init()’:
libretro/libretro.cpp:671:40: error: aggregate ‘retro_midi_interface midi_interface’ has incomplete type and cannot be defined
     static struct retro_midi_interface midi_interface;
                                        ^~~~~~~~~~~~~~
libretro/libretro.cpp: In function ‘void retro_run()’:
libretro/libretro.cpp:806:53: error: invalid use of incomplete type ‘struct retro_midi_interface’
     if (retro_midi_interface && retro_midi_interface->output_enabled())
                                                     ^~
libretro/libretro.cpp:94:15: note: forward declaration of ‘struct retro_midi_interface’
 extern struct retro_midi_interface *retro_midi_interface;
               ^~~~~~~~~~~~~~~~~~~~
libretro/libretro.cpp:807:29: error: invalid use of incomplete type ‘struct retro_midi_interface’
         retro_midi_interface->flush();
                             ^~
libretro/libretro.cpp:94:15: note: forward declaration of ‘struct retro_midi_interface’
 extern struct retro_midi_interface *retro_midi_interface;
               ^~~~~~~~~~~~~~~~~~~~
Makefile.libretro:189: recipe for target 'libretro/libretro.o' failed
make: *** [libretro/libretro.o] Error 1
make: *** Waiting for unfinished jobs....
/home/pi
Could not successfully build lr-dosbox - DOS emulator (/home/pi/RetroPie-Setup/tmp/build/lr-dosbox/dosbox_libretro.so not found).

gcc --version
gcc (Raspbian 6.3.0-18+rpi1+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Anyone knows what is missing for the installation and what needs to be done?
Thanks.

mitu

The problem is not related to RetroPie or your configuration, the upstream project has an error. It's already been reported - https://github.com/libretro/dosbox-libretro/issues/103 - so we'll have to wait for a fix from their side.

Race

@mitu
too bad, but ok - waiting... thanks for reply

SuperFromND

Here's my copy of the core, if you want to install it manually. This was compiled mere days ago, so it's about as up-to-date as you can get. Do note that you might not get support for using this pre-compiled core.

In the meantime, here's a few other bits and pieces of info about lr-dosbox:

Windows 3.1 applications seem to be much more stable in the core than in standalone DOSbox; I was able to run Internet Explorer 3 and browse some local sites properly.
RetroArch isn't able to use DOSbox's mapper to my knowledge, so you'll have to futz around with the core options to get controller support. I'm sure that this will be streamlined in the future.

edmaul69

@supercatfooz i have no issues with windows 3.1 in the standalone version. I dont get on the internet but i have about 100 games on it. I am curious how you got the internet setup on lr-dosbox. I havent used lr-dosbox because every game i tried playing was slow.

SuperFromND

@edmaul69 I bumped up the cycle count in RetroArch settings to ~9,000; works well enough for the most part though it is a tad on the slow side. I'm not 100% sure why lr-dosbox works better than standalone DOSbox when it comes to Windows 3.1, but it's pretty neat nonetheless.

edmaul69

@supercatfooz so what runs better on lr-dosbox than standalone dosbox with windows 3.1? I havent had any issues so im not sure what issues there are?

Race

@supercatfooz said in lr-dosbox compilation error:

Here's my copy of the core, if you want to install it manually.

Can you explain howto install it manually?

SuperFromND

@race Navigate to /opt/retropie/libretrocores, create a new folder named lr-dosbox, put the dosbox-libretro.so file into it, then add this line to /opt/retropie/configs/pc/emulators.cfg:

lr-dosbox = "/opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-dosbox/dosbox_libretro.so --config /opt/retropie/configs/pc/retroarch.cfg %ROM%"

[Assuming you've already installed regular DOSbox here.]