issue with terminal command?

[jaknau]

After setting the terminal to pdf ("set terminal pdfcairo enhanced color") the next two characters seem to be ignored by gnuplot (so I get an error from gnuplot because the first two characters of the next command are missing).
This does not only happen for your header file but also for other similar gnuplot plotting solutions that use popen and fputs.
It can be circumvented by sending two random characters.

However, I wonder what causes this problem and also if there is a more elegant solution?
(Windows 10, Visual Studio 15)