This is a C hmml parser library thing made with flex.
It has just 3 functions, look at hmmlib.h for the API.
To build it, run make, and it'll spit out hmml.a that you just need to include
on the command line when you build stuff. e.g.:
clang myfile.c hmml.a -o mything
(your .c file also needs to #include hmmlib.h)