configure failed, it blames gobject-introspection but it's installed

[Leo Arias]

Hello,

I'm trying to build libunity on an up-to-date raring machine. I did:

bzr branch lp:libunity
cd libunity
sudo apt-get build-dep libunity
./autogen.sh
./configure

If fails saying:
checking for gobject-introspection m4 macros... configure: error: in `/home/elopio/workspace/canonical/libunity/trunk':
configure: error: failed. Please install the package 'gobject-introspection' in order to compile libunity

But I have it installed:
$ apt-cache policy gobject-introspection
gobject-introspection:
  Installed: 1.35.8+git20130220-0ubuntu1
  Candidate: 1.35.8+git20130220-0ubuntu1
  Version table:
 *** 1.35.8+git20130220-0ubuntu1 0
        500 http://cr.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

So, the error message is wrong.