+** Setup build environment
+
+- some packages need to be installed:
+ apt build-essential debhelper simple-cdd
+- user must have a GPG private key to sign trc6500master package (check name in changelog)
+- unfortunatly some GPG public keys are missing for bookworm distribution (A7236886F3CCCAAD148A27F80E98404D386FA1D9 4D64FEC119C2029067D6E791F8D2585B8783D481 4CB50190207B4758A3F73A796ED0E7B82643E131 ED541312A33F1128F10B1C6C54404762BBB6E853 B0CAB9266E8C3929798B3EEEBDE6D2B9216EC7A8), they can be retrieved and install into user trusted key ring.
+ for key in $list; do gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys $key; done
+- to use the user trusted key ring, add the option --keyring ~/.gnupg/pubring.gpg
+- last thing, there's a bug and dep11 repository is not retrieved:
+ source debian6500/simple-cdd/simple-cdd.conf
+ wget ftp://ftp.fr.debian.org/debian/dists/bookworm/main/dep11/Components-amd64.yml.gz
+ mkdir -p $working_dir/simple-cdd/tmp/mirror/dists/bookworm/main/dep11/
+ mv Components-amd64.yml.gz $working_dir/simple-cdd/tmp/mirror/dists/bookworm/main/dep11/
+
+