$ flex --version
flex 2.5.39

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Then I don't know, that one should do fine.

lazy.scad - http://www.thingiverse.com/thing:512443

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Right, I forgot to document that part. But I did it manually on my machine,
so I don't think that causes that 'lexer' error.

Is there an easy way to apply the .patch file to avoid having to make each
change manually?

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I got one step further by running the flex command in msys2 bash:

$ flex -P lexer -o src/lexer.lexer.cpp src/lexer.l

That ran without errors.

Now when I try to build in Qt Creator I get this error:

20:03:01: Starting: "C:\msys64\mingw64\bin\mingw32-make.exe"
C:/msys64/mingw64/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory 'C:/openscad/openscad'
bison -d -p parser -o src/parser_yacc.cpp src/parser.y && if [[ -e
src/parser_yacc.hpp ]] ; then mv src/parser_yacc.hpp src/parser_yacc.h ; fi
0 [main] sh 5524 sync_with_child: child 5184(0x164) died before
initialization with status code 0xC0000142
25 [main] sh 5524 sync_with_child: *** child state waiting for longjmp
/usr/bin/sh: fork: Resource temporarily unavailable
Makefile.Debug:568: recipe for target 'src/parser_yacc.cpp' failed
mingw32-make[1]: *** [src/parser_yacc.cpp] Error 128
mingw32-make[1]: Leaving directory 'C:/openscad/openscad'
Makefile:34: recipe for target 'debug' failed
mingw32-make: *** [debug] Error 2
20:03:04: The process "C:\msys64\mingw64\bin\mingw32-make.exe" exited with
code 2.
Error while building/deploying project openscad (kit: Desktop Qt 5.3
MinGW-w64 64bit (MSYS2))
When executing step "Make"
20:03:04: Elapsed time: 00:03.

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I've updated the documentation with the changes from the .patch file.

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Thanks to the MSYS2 developers, all dependencies needed for OpenSCAD are
available as MSYS2 packages now and can simply be installed using pacman.

I've updated the wiki page...
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Building_on_Microsoft_Windows

Note that there's still an issue with QScintilla crashing when using debug
build (error: "QWidget: Must construct a QApplication before a QWidget").

Anyone having an idea what's wrong there?

The release build does work.

ciao,
Torsten.

That is awesome! Thanks, I'll try to reinstall everything using msys2.

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Compilation on MSYS2 should now work without any changes in the OpenSCAD sources.

Many thanks to Alexpux from MSYS2 for the help.

We might get a debug version from QScintilla as package too, that would enable
us to create debug builds later.

In the meantime it would require to build debug versions of the QScintilla
library.

ciao,
Torsten.