Awesomeful

As of this writing, the ruby-fann library requires FANN 2.1. Since that version of FANN is still in beta, it is not available from the yum repositories yet (as far as I know). Compiling the source is trivial, however:

• Download the source code for FANN 2.1beta from any of the mirrors found here: http://leenissen.dk/fann

• After extracting it, run the usual:

  ./configure
  make
  sudo make install

• Make sure the files are present:

  ls /usr/local/lib |grep fann
  libdoublefann.a
  libdoublefann.la
  libdoublefann.so
  libdoublefann.so.2
  libdoublefann.so.2.0.1
  libfann.a
  libfann.la
  libfann.so
  libfann.so.2
  libfann.so.2.0.1
  libfixedfann.a
  libfixedfann.la
  libfixedfann.so
  libfixedfann.so.2
  libfixedfann.so.2.0.1
  libfloatfann.a
  libfloatfann.la
  libfloatfann.so
  libfloatfann.so.2
  libfloatfann.so.2.0.1

Since these libraries where just installed, you have to run ldconfig in order to cache them and create the required links. This was the gotcha: ldconfig /usr/local/lib

Now, use ruby-gems to install the ruby-fann bindings:

sudo gem install ruby-fann