allow dsssl stylesheets to be specified at scons command line

ChangeLog

@@ -12,6 +12,7 @@ Version NEXT
 	Do not use sgmlformat, call jade directly
 	correctly zero entire sockaddr_in structure during name resolving,
 	  error found by clang.
+	allow docbook dsssl stylesheets to be specified at scons command line  
 
 Version 2.8.1b26 - 1 Oct 2009
 	fver now reports if server can process extra data in input packets.

INSTALL

@@ -55,6 +55,7 @@ SCons command line options:
 	sysconfdir=directory	where to look for fspd and client configuration
 				files. Default prefix/etc
 	without-clients=yes     dont build and install client commands
+	dsssl=directory		Look for DocBook DSSSL Stylesheets there
 
 Client utilities:
         All inter-command states are kept in these three shell environment

site_scons/dsssl.py

@@ -1,12 +1,13 @@
 #
 # SCons Locate DSSSL docbook stylesheets
 #
-# Version 1.1
-# 08-Sep-2014
+# Version 1.2
+# 09-Sep-2014
 #
 
 import os
 import stat
+from SCons.Script import ARGUMENTS
 
 def findDocbookStylesheets(check):
     """Return path to Docbook stylesheets or None."""
@@ -14,6 +15,8 @@ def findDocbookStylesheets(check):
                     "/usr/local/share/sgml/docbook/dsssl/modular",
                     "/usr/share/sgml/stylesheets/dsssl/docbook"
     ]
+    customdsssl = ARGUMENTS.get('dsssl', None)
+    if customdsssl: directories.insert(0, customdsssl)
     files = [ "html/docbook.dsl", "catalog", "common/dbcommon.dsl" ]
     check.Message("Locating Docbook DSSSL Stylesheets... ")
     for d in directories: