print more sensible error for unsupported distros

1 files changed, 4 insertions, 2 deletions

diff --git a/sjhbuild/sysdeps.py b/sjhbuild/sysdeps.py
index 1b0366d..eaeeb9b 100644
--- a/sjhbuild/sysdeps.py
+++ b/sjhbuild/sysdeps.py
@@ -72,8 +72,10 @@ def _parse_dependencies(dname, dversion):
 
     # check whether we have a file matching the exact distro version
     if not [name for name in filenames if name.endswith(suffixes[-1])] :
-        # will break for unknown distros, but that's fine
-        # (=> bug report => add support for distro)
+        if dname not in _unstable_names :
+            sys.stderr.write("ERROR: %r is not a supported distro. If you think it is sufficiently recent to contain everything the latest development version of Sugar needs and would like to see it supported, please file a ticket at dev.sugarlabs.org.\n" % (dname,))
+            return []
+
         uversion = _unstable_names[dname]
         if (dversion == uversion) :
             # no config for unstable