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Hello!

I came across your post in the plan9port issue tracker (9fans/plan9port#130), and was wondering how this devdraw port is compiled. I tried dropping sdl-srv.c in $PLAN9/src/cmd/devdraw and running 9c sdl-srv.c. First it complained about the SDL header:

sdl-srv.c:31:10: fatal error: SDL.h: No such file or directory
 #include <SDL.h>
          ^~~~~~~
compilation terminated.

After changing it to SDL2/SDL.h, the real errors started showing up:

sdl-srv.c:184:13: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  msg->error = SDL_GetError();
             ^
sdl-srv.c:327:2: error: label at end of compound statement
  defualt:
  ^~~~~~~
sdl-srv.c:327:2: warning: label ‘defualt’ defined but not used [-Wunused-label]
sdl-srv.c:67:13: warning: ‘handle_rdmouse’ used but never defined
 static void handle_rdmouse(Wsysmsg *);
             ^~~~~~~~~~~~~~
sdl-srv.c:70:13: warning: ‘handle_bouncemouse’ used but never defined
 static void handle_bouncemouse(Wsysmsg *);
             ^~~~~~~~~~~~~~~~~~
sdl-srv.c:131:1: warning: ‘matchevt’ defined but not used [-Wunused-function]
 matchevt(Evtq q, Evt evt, uchar *tag)
 ^~~~~~~~

For reference, I'm currently running Arch Linux with kernel 4.18.9 and SDL2 version 2.0.8.

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