Quote from: https://github.com/csdms-contrib/mfdrouting

  The programs in this supplement make use of routines from Numerical Recipes, 2nd edition, as well as thestandard C libraries stdlib, stdio, malloc, math. The beginning of each program includes several "#include" statements that indicate the libraries that must be linked during compilation in order for these programs to properly compile. Operating systems and compilers differ, so it is the responsbility  of the user to properly link the codes in this supplement to the required libraries. Each code also has a "standalone" version in which the required Numerical Recipes routines are included directly in the source code. In these standalone versions, the standard C libaries are still required but linkage  to the Numerical Recipes libraries is not. The user should validate the output of any code before proceeding to use the code in their work. No guarantee is expressed or implied regarding the accuracy of these programs. 

  For additional help, example problems, or to send comments, please email Jon Pelletier at jdpellet@email.arizona.edu