Do not install the man page with make install, as it might not be called if
NOPORTDOCS is set. We install the man page manually.
--- xsd/documentation/makefile~	2012-08-10 19:07:34.000000000 -0300
+++ xsd/documentation/makefile	2012-08-10 19:07:48.000000000 -0300
@@ -21,7 +21,6 @@
 	$(call install-data,$(src_base)/schema-authoring-guide.xhtml,$(install_doc_dir)/xsd/schema-authoring-guide.xhtml)
 	$(call install-data,$(src_base)/xsd.xhtml,$(install_doc_dir)/xsd/xsd.xhtml)
 	$(call install-data,$(src_base)/custom-literals.xsd,$(install_doc_dir)/xsd/custom-literals.xsd)
-	$(call install-data,$(src_base)/xsd.1,$(install_man_dir)/man1/xsd.1)
 
 # Dist.
 #