[haiku-development] Build System renames downloaded packages?

Hi there,

while trying to build an Haiku image at work, where I have a nice
proxy, I had to download manually the optional packages I needed
one by one.

Both Vim and Yasm (and maybe some others) were not found
by the build system, so I had a look at the rules involved and found
out that the InstallOptionalHaikuImagePackage rule, looks for
vim-7.2-gcc2-20090531 on the machine, but it downloads (I downloaded)
$(baseURL)/vim-7.2-gcc2-haiku-2009-05-31.zip, which would obviously
did not match. So I renamed the package in the InstallOptionalHaikuImagePackage
rule and it worked.

Renè though, told me that somewhere the build system renames the
downloaded packages, so under the assumption that he doesn't lie :-) ,
I'm wondering why this happens and if it is wanted behavior as it makes
manual download pointless.

Regards,
Salvatore

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