try to install from 0.7.0 src on ubuntu 10.10 64bits vala not found

Hi,

I try to install the IDE on Ubuntu Maverick 10.10 64 bits from the source package 0.7.0
I have the following error:

valide-0.7.0$ ./waf configure
Checking for program gcc,cc : ok /usr/bin/gcc
Checking for program cpp : ok /usr/bin/cpp
Checking for program ar : ok /usr/bin/ar
Checking for program ranlib : ok /usr/bin/ranlib
Checking for program valac : ok /usr/bin/valac
Checking for gthread-2.0 : ok
Checking for program version valac >= 0.1.6 : ok 0.10.0
Checking for program msgfmt : ok /usr/bin/msgfmt
Checking for program intltool-merge : ok /usr/bin/intltool-merge
Checking for header locale.h : ok
Checking for program valadoc : not found
Checking for glib-2.0 >= 2.18.0 : ok
Checking for gio-2.0 >= 2.18.0 : ok
Checking for gobject-2.0 >= 2.18.0 : ok
Checking for gmodule-2.0 >= 2.18.0 : ok
Checking for gtk+-2.0 >= 2.18.0 : ok
Checking for libxml-2.0 >= 2.5.0 : ok
Checking for gtksourceview-2.0 >= 2.10.0 : ok
Checking for vala-1.0 >= 0.8.1 : Package vala-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `vala-1.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'vala-1.0' found
 error: the configuration failed (see '/home/jules/Bureau/valide-0.7.0/_build_/config.log')

vala seems to be install on the system but vala --version return : No source file specified

Thanks