Either CMake config file or pkgconfig .pc needed

[barracuda156]

Currently neither is generated:

a ./opt/local/lib/libhptt.a
a ./opt/local/include/compute_node.h
a ./opt/local/include/hptt.h
a ./opt/local/include/hptt_types.h
a ./opt/local/include/macros.h
a ./opt/local/include/plan.h
a ./opt/local/include/transpose.h
a ./opt/local/include/utils.h

It is probably also better to install headers to ${prefix}/include/hptt and not dump them into a common folder :)