[vbox-dev] Changes to source don't seem to have effect on my rebuild

Frank Mehnert frank.mehnert at oracle.com
Tue Nov 6 00:00:09 PST 2012

Hi Tsukishiro,

On Tuesday 06 November 2012 02:17:56 tsukishiro yamazaki wrote:
> I am still quite new to modifying VBox source code so please bear with my
> ignorance.
> My goal is to somehow manually hard code the memory map for VBox.
> I found that the BIOS INT 15 function, used together with E820, is handled
> in Vbox/Devices/PC/BIOS/system.c
> However, when I tried modifying the code and rebuild VBox, no changes seem
> to have taken effect.
> I was expecting an error since I practically commented out the entire
> contents of the case 0x20 block.
> How do I rebuild the source to incorporate the changes I made?
> Btw, I downloaded Virtual Box 4.2.4 from Virtual Box homepage and followed
> this guide to installing it.
> http://www.howtoforge.com/virtualbox_ubuntu

please check your AutoConfig.kmk. I assume it contains


If your build environment does not contain the Watcom C compiler,
the alternative BIOS source file is used, see


To use the C files, install the Open Watcom C compiler, see


Then rerun the configure script and make sure it finds the compiler
and sets VBOX_WITH_OPEN_WATCOM properly.

Kind regards,

Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox
ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | 71384 Weinstadt, Germany

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