These instructions are intended for Linux. On other systems you will have to construct something compatible to build gr-audio-portaudio. In order to use portaudio with gnuradio you will need to download and install a late version of portaudio. Please cd to a directory where the cvs command below will be allowed to build the portaudio directory tree. cvs -d:pserver:anonymous@www.portaudio.com:/home/cvs co -r v19-devel portaudio This will make a directory portaudio unless you already have one. It will check out the Portaudio API version 2 release 1.9. In the directory where this README is found, there is a patch file. Hopefully this patch will not be needed for long. Portaudio is working with us to use auto*, libtool, etc. The patch is autoconfiscate.patch. cd to the portaudio directory and run patch -p0