[bug-libmatheval] libmatheval not thread safe?

[nate lust]

I am working on a small project, using libmatheval and openmp, it seems 
that when i try and call the libmatheval function from inside the parallel 
region i segfault (or get other memory tramples). If i set the number of 
threads to one, it runs fine, but defeats the purpose of my code. Is 
there anyway to make this tread safe?
nate