C code for hypergeometric functions

[ROQUE DONIZETE DE OLIVEIRA]

Does anyone have any C source code to compute the hypergeometric functions ?
I'm particularly interested in the confluent hypergeometric function of first
and second kind (  M(a,b,z) or some other notation, where z is a complex number).
Any pointers or source code is appreciated. If you have a freely available
source code, please e-mail it to me. If there is enough interest (and I get some
responses) I'll summarize to the net.
Thanks.
  
  Roque D. Oliveira
  oliveria at caen.engin.umich.edu
  Computer Aided Engineering Network
  The university of Michigan