[Samba] Can't compile samba 4.2.x on Jessie RC2

[MORILLO Jordi]

Hello !
Debian Jessie is coming soon (25 april 2015) so i'm trying to compile samba 4.2.x on Jessie RC2

Samba 4.2.0 and samba 4.2.1 (even with bugfix 11135 from a.bartlett) can't compile :
Checking for gnutls >= 3.0.0s                                                                   : not found
Checking for gnutls >= 1.4.0 and broken versions                                                : not found
/usr/local/src/samba-4.2.1/source4/lib/tls/wscript:37: error: Building the AD DC requires GnuTLS (eg libgnutls-dev, gnutls-devel) for ldaps:// support and for the BackupKey protocol

libgnutls28-dev is already installed :

apt-cache show libgnutls28-dev
Package: libgnutls28-dev
Source: gnutls28
Version: 3.3.8-6
Installed-Size: 2885
Maintainer: Debian GnuTLS Maintainers <pkg-gnutls-maint at lists.alioth.debian.org>
Architecture: amd64
Replaces: gnutls-dev
Provides: gnutls-dev, libgnutls-openssl-dev

Do I need to open a bug case ?
Thanks for all