Don't distribute generated version.hxx and don't clean version

Now the clean operation in src_root should result in state identical to
distributed (which appears to be important to some packaging systems, e.g.,
Debian).

1 files changed, 7 insertions, 2 deletions

diff --git a/buildfile b/buildfile
index 90a4c09..3ef5829 100644
--- a/buildfile
+++ b/buildfile
@@ -6,8 +6,13 @@
     doc{INSTALL LICENSE NEWS README version}                      \
     file{INSTALL.cli bootstrap* config.guess config.sub manifest}
 
-doc{version}: file{manifest} # Generated by the version module.
-doc{version}: dist = true
+# The version file is auto-generated (by the version module) from manifest.
+# Include it in distribution and remove when cleaning in src (so that clean
+# results in a state identical to distributed).
+#
+doc{version}: file{manifest}
+doc{version}: dist  = true
+doc{version}: clean = ($src_root != $out_root)
 
 # Don't install tests or the INSTALL file.
 #