Comment 1 for bug 745881

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Marcin Juszkiewicz (hrw) wrote : Re: rtai version 3.8.1-2 failed to build on armel

From README.INSTALL:

Notice also that this release is for use with:
- i386,
- x86_64,
- PPC.

So it looks like upstream never supported ARM machines. None of previous Ubuntu releases provided ARM packages of rtai.