Attempts to do 'make install-html' fail with:

make[1]: Leaving directory '/usr/src/sed-4.4-1.i686/build'
Making install-html in po
make[1]: Entering directory '/usr/src/sed-4.4-1.i686/build/po'
make[1]: *** No rule to make target 'install-html'.  Stop.
make[1]: Leaving directory '/usr/src/sed-4.4-1.i686/build/po'
make: *** [Makefile:3027: install-html-recursive] Error 1

Prior to sed 4.3, this didn't matter - you could work around the problem
by using 'make -C doc install-html'.  But with the addition of commit
3b29bece converting to non-recursive makefiles, there is now no
doc/Makefile, and therefore no way to install the html.  I'm not quite
sure of the best way to get po/Makefile to support a no-op install-html
target.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org