boost jam fixes for OSF

[alx_s]

Attached patch fixes 2 problems on OSF:

1. build.sh doesn't build binaries.
2. JAMUNAME variable is not set.

[Markus Schöpflin]

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Could you please mail me the patch as attachement? I 
somehow can't seem to download it. Sorry for the 
inconvenience.

[Markus Schöpflin]

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Forget about my last not, I managed to download it.

I have to admit, I don't understand the purpose of your patch 
to "build.sh" but I discovered some other problems in it and 
fixed those. Could you please get the latest revision and try 
again. If it still doesn't work for you, could you please explain 
to me what exactly is happening on your side, and why you 
think your patch fixes this.

I'll now look at the patch for jam.h

[Markus Schöpflin]

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I reproduced your build.sh problem on Tru64 4.0F, and 
applied the patch. Please indicate exactly the platform and 
version you are using next time.

I checked in a slightly modified version of your fix to jam.h, 
because unix is already defined on Tru64 4.0F but not on 
Tru64 5.1.

Could you please check out if this fixes all your issues?

[alx_s]

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I had the problem with build.sh on Tru64 5.1
Actually, it a problem with /bin/sh, may be you have a
different version. The problem is that jam0 gets an
additional empty string as a parameter, so it tries to build
target "", which cannot be found.
I had this problem for quite some time, just always manually
copied the last command from build.sh output to build boost jam.

The latest version from CVS works fine for me.

[Markus Schöpflin]

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Fixed in CVS.