On the 64bit release i have this error:
The gegl-0.1.6 is the minimum release require by gimp 2.7.2.

Note:
1) No problem when previously i installed gimp 2.7.1 (on both 32 and 64 bit editions).

2) Eventually I put later the error on the 32 bit release.

It looks like you may have compiled libavformat without producing a shared library. Is there any reason you are not using libavformat-dev pacakge?

Evo2.

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Mmm.
I don't remember installing this package, perhaps was some automatic dependencies.
I made a custom ffmpeg do you think could be the problem? About that package?
I have installed that package:
$ sudo apt-get install libavformat-dev
but the issue remain the same on the 64 bit system.

While on the 32 bit system i have a different error during the compilation of the gtk (that should be >= 2.24.3):
Where is the gdk-pixbuf package?

You could try installing GIMP from:
# towo's repository for aptosid
# secure APT - apt-get install frickelplatz-archive-keyring frickelplatz-keyring frickelplatz-keyrings
# deb http://frickelplatz.de/debian/ sid main contrib non-free

# apt-cache policy gimp
gimp:
Installed: 2.6.11-2
Candidate: 2.7.3~git20110415
Version table:
2.7.3~git20110415 0
500 http://frickelplatz.de/debian/ sid/main i386 Packages
*** 2.6.11-2 0
500 http://mirrors.kernel.org/debian/ unstable/main i386 Packages
100 /var/lib/dpkg/status

Mmm i don't know.
I would like put the development release of gimp on a different path for avoid stability problems using repository of a different release.
And on the same time i can use even the stable gimp release.

However, seem i was right:
After the remove of the ffmpeg-custom package i was able to compile gegl.

Now i found even where is it the other package.
Index of /pub/gnome/sources/gdk-pixbuf/2.22

Then i write:
$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/gimp-devel/lib/gtk-2.0/2.10.0/immodules
but the problem remain the same:

Even using the documentation (this time i opt for the path /opt/gtk):
Building GTK+ on UNIX-like systems
the problem remain the same.

Well it just worked for me.
I did a "aptitude build-dep gimp" then compiled+checkinstalled gegl version 0.1.6 and babl version 0.1.4, every one with their default path (/usr/local/lib). Then compiled+checkinstalled gimp.
I failed to compile it with the --prefix=/opt options so i left it with the default path and it worked.

The only modifications i did it was the naming of the resulting packages (from the checkinstall config menu) to gimp-2.7.2, babl-0.1.4, gegl-0.1.6.

And i had to define the (the name of the .conf is not important)

/etc/ld.so.conf.d/gimp27.conf

file with

in it. Then issued a

command to include that folder in the library loading list.

When i tried to compile gimp-2.7.2 no matter where i specified (so /opt or the default path) i obtain always the message:
checking for GTK+ - version >= 2.24.3... no
so i tried to compile gtk+2.24.4 but i have another error.
Using Lenny i haven't any problem for install gimp 2.7.1, the same using Squeeze.
On that case i compiled only babl,gegl,gimp.

I have:

But i use Debian testing - maybe in Squeeze is older? Probably for gimp 2.7.2 they bumped the required gtk version.

Edit: Squeeze has 2.20.1-2, so you have to update your gtk if you can.

What is your version of libgtk2.0-dev?

$ apt-cache show libgtk2.0-dev
Package: libgtk2.0-dev
Priority: optional
Section: libdevel
Version: 2.20.1-2

So you have to upgrade your gtk.
Gtk from the testing repository is at the version you need, but you might run into dependency problems because gtk is depended upon by most graphical apps.
Maybe you can upgrade only the dev package.