A few issues:

Could you consider using a %description something like:
   qfits is a stand-alone C library offering easy access to FITS (Flexible Image 
   Transport System) files.
so that people like me aren't completely bewildered.  (It's still bewildering,
but it's polite to at least explain acronyms to those who might come across the
package.)

rpmlint finds a few things to complain about:
W: qfits unused-direct-shlib-dependency /usr/lib64/libqfits.so.0.0.0
/lib64/libm.so.6
This is not a big deal; autoconf-generated stuff often tends to link in basic
system libs even when they aren't used.

E: qfits-tools binary-or-shlib-defines-rpath /usr/bin/dtfits ['/usr/lib64']
(and ten other rpath errors)
These are blockers; see the "Beware of Rpath" section of
http://fedoraproject.org/wiki/Packaging/Guidelines

I have modified the description according to your recommendation.

It's weird, but I don't get any error about rpaths (I'm building on 2
processors, i386). I have checked the binaries with chrpath. 

Anyway, I have added a --disable-rapth to %configure
Spec URL: http://astro-sfg.fis.ucm.es/~spr/qfits.spec
SRPM URL: http://astro-sfg.fis.ucm.es/~spr/qfits-6.2.0-0.3.src.rpm

Moved to brand new fedorapeople

Spec URL: http://sergiopr.fedorapeople.org/qfits.spec
SRPM URL: http://sergiopr.fedorapeople.org/qfits-6.2.0-0.3.src.rpm

Updated dist tag

Spec URL: http://sergiopr.fedorapeople.org/qfits.spec
SRPM URL: http://sergiopr.fedorapeople.org/qfits-6.2.0-0.4.src.rpm

I meant updated license tag, sorry

Rebuild fails on dist-f8.

http://koji.fedoraproject.org/koji/taskinfo?taskID=167375

It was a problem with "open", thanks

New patched srpm:

Spec URL: http://sergiopr.fedorapeople.org/qfits.spec
SRPM URL: http://sergiopr.fedorapeople.org/qfits-6.2.0-1.fc7.src.rpm

For 6.2.0-1:

! Naming suggestion
  - Well, IMO it is better that
    * qfits should be renamed to qfits-libs
    * qfits-libs should be renamed to qfits

* Requires for /sbin/ldconfig
  - "Requires(post,postun): /sbin/ldconfig" is not needed.
    (Still %post, %postun themselves are needed)

* defattr
  - We now recommend %defattr(-,root,root,-)

* Timestamps
  - For keeping timestamps, I recommend
-----------------------------------------------------
%{__make} DESTDIR=%{buildroot} INSTALL="%{__install} -p" install
------------------------------------------------------
    This will keep timestamps on installed header files and
    man files
    ! Note: The method above usually works on recent Makefile.

I think you mean: 
qfits -> qfits-lib 
qfits-tools -> qfits
Is that correct? I have changed the names accordingly and fixed the other
problems. Here there are the new files:

Spec URL: http://sergiopr.fedorapeople.org/qfits.spec
SRPM URL: http://sergiopr.fedorapeople.org/qfits-6.2.0-2.fc7.src.rpm

(In reply to comment #9)
* Naming

> I think you mean: 
> qfits -> qfits-lib 
> qfits-tools -> qfits
> Is that correct? 
  - Yes, however
  * Many packagers seem to choose -libs, not -lib: so IMO
     qfits-libs
     qfits
     qfits-devel (not qfits-libs-devel)
    is better
   * Also, qfits should have "qfits-libs = %{version}-%{release}"
     (and qfits-devel should have
      "qfits-libs = %{version}-%{release}")

* Group
  - IMO it is better that the Group of qfits-libs is
    "System Environment/Libraries".

* %check
  - As source code has test/ subdirectory and "make check"
    can be executed, please add %check stage and do
    "make check".

I have included your comments in the next version:

Spec URL: http://sergiopr.fedorapeople.org/qfits.spec
SRPM URL: http://sergiopr.fedorapeople.org/qfits-6.2.0-3.fc7.src.rpm

Okay.

-----------------------------------------------------
   This package (qfits) is APPROVED by me
-----------------------------------------------------

New Package CVS Request
=======================
Package Name: qfits
Short Description: A stand-alone general purpose FITS library
Owners: sergiopr
Branches: FC-6 F-7
InitialCC: 
Cvsextras Commits: yes

cvs done.