pty.h missing for MacOS X

[Ben Abbott]

On MacOS X, building the gui ends with ...

/Developer/usr/bin/llvm-g++-4.2 -c -pipe -g -gdwarf-2 -fPIC -Wall -W 
-DHAVE_POSIX_OPENPT -DHAVE_PTY_H -DHAVE_OPENPTY -DQT_GUI_LIB -DQT_CORE_LIB 
-DQT_SHARED -I/opt/local/share/qt4/mkspecs/macx-g++ -I. -I. -I. 
-I/opt/local/include/QtGui -I/opt/local/include/QtCore -I/opt/local/include -o 
kpty.o unix/kpty.cpp
unix/kpty.cpp:65:18: error: pty.h: No such file or directory
unix/kpty.cpp: In member function ‘bool KPty::open()’:
unix/kpty.cpp:221: error: ‘::openpty’ has not been declared

It's been a while since I tried to build the gui. What I did was to ...

        rm gui
        hg pull ; hg update -C gui
        cd gui
        qmake
        make

In any event, after poking about on Google, it looks to me like an issue with 
gnulib (?)

        http://lists.gnu.org/archive/html/bug-gnulib/2009-12/msg00090.html

Any one have any advice as to what I might try to continue ?

Ben