diff --git a/src/python/jw/pkg/cmds/projects/CmdBuild.py b/src/python/jw/pkg/cmds/projects/CmdBuild.py
index 09f71122..3a29b899 100644
--- a/src/python/jw/pkg/cmds/projects/CmdBuild.py
+++ b/src/python/jw/pkg/cmds/projects/CmdBuild.py
@@ -162,15 +162,16 @@ class CmdBuild(Cmd):  # export
                 log(DEBUG, f'--- Adding dependency tree of module "{m}"')
                 add_dep_tree(m, dep_flavours, dep_tree, all_deps)
             while len(all_deps):
-                # Find any leaf
-                for d in all_deps:
+                # Find any leaf, deterministically: sorted, so that the
+                # order is reproducible across runs
+                for d in sorted(all_deps):
                     # Dependency d doesn't have dependencies itself
                     if not len(dep_tree[d]):
                         break  # found
                 else:  # no Leaf found
                     raise Exception(
                         'Fatal: Dependencies between these modules are unresolvable: '
-                        ', '.join(all_deps)
+                        ', '.join(sorted(all_deps))
                     )
                 order.append(d)  # do it
                 # bookkeep it
diff --git a/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py b/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
index 329b941f..c19ebb47 100644
--- a/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
+++ b/src/python/jw/pkg/cmds/projects/CmdRequiredOsPkg.py
@@ -66,6 +66,7 @@ class CmdRequiredOsPkg(Cmd):  # export
                 vals = self.app.get_values(deps, ['pkg.requires.' + sec], [flavour])
                 if vals:
                     requires |= set(vals)
-        out = [f'"{dep}"' for dep in requires] if args.quote else requires
+        out = sorted(requires)
+        out = [f'"{dep}"' for dep in out] if args.quote else out
         # TODO: add all not in build tree as -devel
         print(' '.join(out))