Qun Liu

@ntlewis Hi Neil, I find that we can add `-cpp` flag to `gfortran` compiler and `-fpp` flag to Intel fortran compiler `ifort` to enable preprocessing for the files ending with...

Perhaps try changing [L826](https://github.com/twilsonco/latexdiffcite/blob/master/src/latexdiffcite/latexdiffcite.py#L826) from ``` process = subprocess.Popen(args, stdout=f, stderr=subprocess.PIPE) ``` to ``` process = subprocess.Popen(' '.join(args), shell=True, stdout=f, stderr=subprocess.PIPE) ``` See [this problem](https://stackoverflow.com/questions/2400878/why-subprocess-popen-doesnt-work-when-args-is-sequence) on Stack Overflow.