--- a/compiler/bmake.bat	Wed Sep 02 18:15:44 2015 +0100
+++ b/compiler/bmake.bat	Mon Sep 14 11:19:10 2015 +0100
@@ -4,6 +4,9 @@
 @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%"
 
 make.exe -N -f bc.mak  %DEFINES% %*