How to set the CMAKE_PREFIX_PATH?

Try to run cmake -DCMAKE_PREFIX_PATH=/your/path .

CMAKE_PREFIX_PATH works as a build directive, rather than as an environment variable. Moreover, you may perform the build into a dedicated temporary directory (it's cleaner, because when done, you can remove that temporary directory and you get back a clean pristine source tree).

$ mkdir -p tmpbuild && cd tmpbuild
$ cmake -DCMAKE_PREFIX_PATH=~/deliveries/hiphop ..
$ make install
$ cd ..