#2 Complete quoting for parameters in "configure.ac"

[Markus Elfring]

I recommend to be more explicit where macro expansion will not be required.
http://autogen.sourceforge.net/acquoting.html
http://www.gnu.org/software/autoconf/manual/m4/Quoting-Arguments.html

http://pycaml.cvs.sourceforge.net/viewvc/pycaml/pycaml/configure.in?revision=1.1&view=markup