Dependencies

[Alex Elder <elder@dreamhost.com>]

I occasionally bump into newly-required packages when I'm trying
to build ceph.  I don't remember what they have been, but today I
hit this when I tried "make clean":

     configure: error: --with-radosgw was given but libcurl (libcurl-dev 
on debian) not found

That was resolved by installing libcurl4-gnutls-dev (at least I
think that's what made it go away).

After that I hit this:

     configure: error: --with-gtk2 was given, but test for gtkmm failed

That took a number of trials, but eventually I think the package
that I installed which made this problem go away was libgtkmm-2.4-dev.

Is there any way that we can do any or all of these?
- we can identify when a new dependency like that has been added
- we can do this automatically
- we can mention something (like in a release announcement) when
   new dependencies have been added since last time
- we can do a nicer job of telling the user that a particular
   package is missing--better than the "test for gtmm failed" kind
   of message that the configure script provides

					-Alex