It seems that an attempt was made to incorporate borland compatibility
into the irrlicht v1.4 engine. However Irrlicht still needs some patching
to make it work with bcb6. I prepared the file:
http://www.xs4all.nl/~sbmpost/Irr140BCB6.zip
To apply this patch just copy (and possibly overwrite) to the Irrlicht directory
structure. This patch also contains all necessary directx files.
(dlls/includes). After applying the patch you should be able to compile
irrlicht.dll right away without additional requirements (use the project
file irrlicht.bpr). The same goes for the examples/demo.bpr file.