anchor.diff:  @ECHO off
  +
  +SET WINFLEXBISON=0
   
   ECHO -- [ running ] "stage: prepare"
   
   ECHO -- installing flex/bison
  -cinst winflexbison
  +IF WINFLEXBISON==1 (
  +	cinst winflexbison
  +)
   
   ECHO -- setting paths
   SET MINGW_BIN=C:\mingw-w64\i686-5.3.0-posix-dwarf-rt_v4-rev0\mingw32\bin
  
positive.code: RENAME mingw32-make.exe make.exe
  POPD
  
  ECHO -- renaming winflexbison exes in-place
  PUSHD %WINFLEXBISON_BIN%
  RENAME win_bison.exe bison.exe
  RENAME win_flex.exe flex.exe
  POPD
  
  ECHO -- ensuring proper tree
  IF NOT EXIST build MKDIR build
  
negative.code: 
  ECHO -- selecting build target
  
  IF WINFLEXBISON==1 (
  	SET FLEX=C:\ProgramData\chocolatey\lib\winflexbison\tools\win_flex.exe
  	SET BISON=C:\ProgramData\chocolatey\lib\winflexbison\tools\win_bison.exe
  	SET WINFLAGS=--wincompat
  ) ELSE (
  	SET FLEX=c:\MinGW\msys\1.0\bin\flex.exe
  	SET BISON=c:\MinGW\msys\1.0\bin\bison.exe
  	SET WINFLAGS=
  )
  
  SET MAKEFLAGS=WINFLAGS=%WINFLAGS% FLEX=%FLEX% BISON=%BISON%
  
  IF "%APPVEYOR_REPO_TAG%"=="true" (
  	ECHO -- building for release
  