How do I open a PTY master?

How do I open a PTY master? I am trying to compile a Qt Application called QTermWidget 0.1 for a Digi ConnectCore Wi-i.MX51 (running Digi EL 5.9 on the host computer and Linux 2.6.35.15 on the CCWMX51JS) and when I do I get the following error:

qtermwidget/lib/kpty.cpp:231:3: Fehler: #error No method to open a PTY master detected.

I learned that I needed to add one of the following lines to the lib.pro file, depending on my system pseudo terminal parameters although this did not work either.
DEFINES += HAVE_POSIX_OPENPT
or
DEFINES += HAVE_GETPT

Does anybody know how the correct Defines? Can anyone help show me an example with openpty() or forkpty()? Where would I find the system pseudo terminal parameters?

Here is the link to the Qt App, QTermWidget: http://qtermwidget.sourceforge.net/

The end project is to find a Qt terminal that I can compile and run on a i.MX51 SoC. Any suggestions?

Thanks in advance!