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third_party/portaudio/README.configure.txt

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+PortAudio uses "autoconf" tools to generate Makefiles for Linux and Mac platforms.
+The source for these are configure.in and Makefile.in
+If you modify either of these files then please run this command before
+testing and checking in your changes. I run this command on Linux.
+
+   autoreconf -if
+
+If you do not have autoreconf then do:
+   sudo apt-get install autoconf
+
+If you get error like "possibly undefined macro: AC_LIBTOOL_WIN32_DLL"
+then you try installing some more packages and then try again.
+
+   sudo apt-get install build-essential
+   sudo apt-get install pkg-config
+   sudo apt-get install libtool
+   autoreconf -if
+
+Then test a build by doing:
+   
+   ./configure
+   make clean
+   make
+
+then check in the related files that are modified.
+These might include files like:
+
+   configure
+   config.guess
+   depcomp
+   install.sh
+