proj.4 installation

proj.4 is a map projection library used by numerous fossg products.

Here is the best set of instructions I have seen.
* http://geodjango.org/docs/install.html

$ wget http://download.osgeo.org/proj/proj-4.6.1.tar.gz
$ wget http://download.osgeo.org/proj/proj-datumgrid-1.4.tar.gz
$ tar xzf proj-4.6.1.tar.gz
$ cd proj-4.6.1/nad
$ tar xzf ../../proj-datumgrid-1.4.tar.gz
$ cd ..
$ ./configure
$ make
$ sudo make install
$ cd ..

Read this if you have issues.