unable to map cygSDL error

Ken Brown kbrown@cornell.edu
Fri Jun 22 20:12:00 GMT 2018

On 6/22/2018 1:02 PM, massimiliano wrote:
> Ken Brown-6 wrote
>> On 6/14/2018 11:22 AM, Massi Alvioli wrote:
>>> As you mention in your post, I ran into the same problem:
>>> https://cygwin.com/ml/cygwin/2018-05/msg00207.html
>>> so I would like to know if you can help me solve the problem.
>> Until someone figures out the underlying cause of the "unable to map"
>> error for cygSDL*.dll, my only suggestion is to try to work around the
>> problem as I did for gimp: avoid using SDL.  In your case, I think SDL
>> is brought in via the package libwx_gtk3u3.0_0.  If you look at the
>> source for that package, you'll see that it uses the configure option
>> --with-sdl.  So you could try to rebuild it without that option.
>> Hi Ken,
>> I tried to compile the libwx_gtk3u3.0_0 package: I installed the package
>> source using cygwin's setup, then cd /usr/src/wxWidgets3.0-3.0.3-1.src,
>> edited wxWidgets3.0.cygport to remove --with-dsl, and issued the commands
>> cygport wxWidgets3.0.cygport prep/compile/test/install. After installing
>> loads of new cygwin packages required to build wxwidgets, I compiled
>> GRASS GIS again but still I have no luck - same "unable to map
>> cygSDL2xxx.dll
>> error message at startup.
>> Is there any obvious flaw in my procedure? any other idea?

Two things:

1. --with-sdl occurs twice in the .cygport file.  Be sure to remove both 

2. Running 'cygport wxWidgets3.0.cygport prep/compile/test/install' is 
not enough.  The 'install' part of this uses a destination directory 
'inst' in the work directory created by cygport.  You also have to run 
'cygport wxWidgets3.0.cygport package', which creates several package 
tarballs in the 'dist' directory.  The best way to proceed from there is 
explained in


under "Creating an overlay Cygwin package server".  If you use this 
method, then you'll have to bump the release number in the .cygport file 
so that setup will recognize that there's a new version of libwx_gtk3u3.0_0.


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