VBox complains about windres generating wrong obj format

[lucky7456969]

windres reported the following errors.
What about them?

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kBuild: Generating C:/vbox/virtualbox-5.0.0/out/win.x86/release/obj/VBoxREMImp/V
BoxREMRes.o
windres: unknown format type `C:/vbox/virtualbox-5.0.0/include'
windres: supported formats: rc res coff
kmk: *** [C:/vbox/virtualbox-5.0.0/out/win.x86/release/obj/VBoxREMImp/VBoxREMRes
.o] Error 1
kmk: *** Waiting for unfinished jobs....
kmk: *** Exiting with status 2

[mpack]

Shouldn't you ask in a windres forum? I've never used windres, but it looks like you're passing a folder name as the input. Flying blind, I'd expect windres to expect either a filename or a wildcard filespec.

[CaptainFlint]

I met with a similar problem when I was building VB from source. The problem is, windres is from the 32-bit mingw (which is version 3.x) and just does not understand the object file format it was fed with.
I worked this around by editing the src\recompiler\Makefile.kmk file, where I search for the line

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VBoxRemPrimary_SOURCES.win = $(VBoxREMImp_0_OUTDIR)/VBoxREMRes.o

and replace it with:

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VBoxRemPrimary_SOURCES.win =
VBoxRemPrimary_SOURCES.win.amd64 = $(VBoxREMImp_0_OUTDIR)/VBoxREMRes.o

(that is, use the resource for 64-bit version only). I don't know what hacks Oracle uses to build their version, though.