the scons logic is dumb and will always regenerate the man pages.
forcibly disable that as the releases contain the man pages.

--- a/SConstruct
+++ b/SConstruct
@@ -575,6 +575,7 @@
     manbuilder = "xmlto man $SOURCE; mv `basename $TARGET` $TARGET"
 else:
     announce("Neither xsltproc nor xmlto found, documentation cannot be built.")
+manbuilder = htmlbuilder = False
 if manbuilder:
     env['BUILDERS']["Man"] = Builder(action=manbuilder)
     env['BUILDERS']["HTML"] = Builder(action=htmlbuilder,