To install the vis library, simply unzip the the distribution and place the src directory in your IDL path and IDL DLM path (there are multiple ways to do this, if you are using the IDL Workbench, you can set this in the preferences). To build the portion of the library written in C, go to the top level directory of the distribution and type:

  $ make

If there are problems with the build, most likely your !make_dll system variable is not setup correctly or you have an old version of IDL (pre IDL 6.2). To install in an old version of IDL, change directories to the flow source code and type from within IDL:

  IDL> vis_make_dll, 'vis_flow.c'