--- a/mingwmake.bat	Sat Nov 22 23:38:38 2014 +0100
+++ b/mingwmake.bat	Sat Nov 22 23:38:41 2014 +0100
@@ -3,10 +3,14 @@
 @REM type mingwmake, and wait...
 @REM do not edit - automatically generated from ProjectDefinition
 @REM -------
+@SET DEFINES=
+@REM Kludge got Mercurial, cannot be implemented in Borland make
+@FOR /F "tokens=*" %%i in ('hg root') do SET HGROOT=%%i
+@IF "%HGROOT%" NEQ "" SET DEFINES=%DEFINES% "-DHGROOT=%HGROOT%"
 
 @pushd ..\rules
 @call find_mingw.bat
 @popd
-make.exe -N -f bc.mak %USEMINGW_ARG% %*
+make.exe -N -f bc.mak %DEFINES% %USEMINGW_ARG% %*