How can I make patch for mxe-build ? (was Re: Windows Octave compilation)

[Tatsuro MATSUOKA]

I have posted:
http://octave.1599824.n4.nabble.com/Re-Windows-Octave-compilation-td4665267i40.html#a4665493


>> Failed to build package pstoedit!

>> ------------------------------------------------------------
>> make[3]: *** [libpstoedit_la-dynload.lo] Error 1
>> make[3]: Leaving directory 
>> 
> `/e/usr/Tatsu/mingw32work/octave/mxe-octave/mxe-octave/tmp-pstoedit/pstoedit-3.62/.build/src'
>> make[2]: *** [install-recursive] Error 1
>> make[2]: Leaving directory 
>> 
> `/e/usr/Tatsu/mingw32work/octave/mxe-octave/mxe-octave/tmp-pstoedit/pstoedit-3.62/.build'
>> make[1]: *** [build-only-pstoedit] Error 2
>> make[1]: Leaving directory 
>> `/e/usr/Tatsu/mingw32work/octave/mxe-octave/mxe-octave'
>> real    8m50.839s
>> user    0m20.291s
>> sys     1m49.394s
>> ------------------------------------------------------------
>> [log]     
>  /e/usr/Tatsu/mingw32work/octave/mxe-octave/mxe-octave/log/pstoedit
>> 
>> The log file is attached. 
>> The origin of the error, very MS-win like functions, strcpy_s, and 
> strcat_s. 
>> These can be replaced by strncpy and  strncat, respectively.
>> 
> Sorry I have mislead.  MinGW-w64 (32 and 64 bit) has a definition verry MS 
> like 
> secure functions like (function name)_s.  The definition of in pstoedit and 
> MinGW-w64 seems to be inconsistent.

To overcome this issue, the patch is needed.  In src directory, there are patch 
files related to each dependency exist.  For example, for gnuplot, 
gnuplot-1-fixes.patch and gnuplot-2-win64.patch exist and applied them before 
the build process.  How can I make such patch for pstoedit? In the each mk 
file, patch file does not refer.
Perhaps the procedure to apply is described elsewhere. How can I find this? 

Regards

Tatsuro