If you compile screen on Mac OS X and encounter the following error:

   pty.c:38:26: error: sys/stropts.h: No such file or directory

then try applying the included screen pty.c patch for this problem as follows:

   cd /path/to/screen-build-tree
   patch -p0 </path/to/brltty/Patches/screen-pty.patch

This patch was downloaded from the following location:

   https://trac.macports.org/raw-attachment/ticket/13009/patch-pty.c

It is documented as MacPorts ticket 13009, which can be read at the following 
location:

   https://trac.macports.org/ticket/13009