speex header location, .pc file and backward compatibility
trying to compile gstreamer speex plug-in with speex 1.1.6, i had the bad
experience to see that headers were moved.
the good point was that now speex uses a .pc file
the bad point is that the include path in it is bad
in order that program using speex won't have to change all their includes but
only their configure.ac file, it should be better to change the following :
Cflags: -I${includedir} => Cflags: -I${includedir}/speex
i suppose it is the same for speex 1.0.4 (i did not check this one)