Download the source code. Unzip it. Follow the instructions in README.TXT:
COMPILATION: You will need a standard C/C++ compiler such as GNU gcc (version 3). This is likely available on all Linux/Unix platforms. For MS-DOS, DJGPP or MinGW are appropriate choices. To help compiling, see documentation (basically, just be sure to select the correct Makefile and type make -f Makefile.*)
That ought to work.
I just figured out how to do this myself: these are the snags a ran into with compiling and how I solved them. I am on windows 7 64bit machine with the latest cygwin standard installation.
you need to edit the makefile so the options are like this:
SYS = UNIX
WITHRPLUGINS = WITHWEBCHECK = FORCE32BIT = 1 WITHZLIB = WITHLAPACK = FORCE_DYNAMIC =
compiler for me threw an error because the source code uses a function call to "fopen64" in c++, which wasn't recognized by the compiler (gcc 4.3.4) so just did a find replace like so:
sed -i *.cpp s/fopen64/fopen/g
compiler then threw another error "ld: cannot find -lgcc_s", which i guess is a known bug which you can read about here: http://cygwin.com/ml/cygwin/2007-06/msg00332.html i fixed this by adding the flag -static-libgcc in the section of the makefile where you can add additional flags to the compiler
CXXFLAGS = -static-libgcc
then it compiled just fine!
hope this helps someone..
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You need to follow the instructions that David linked to, then if something does not work and you have specific questions you can ask those.