Deal with "#define _XOPEN_SOURCE"  in header files (eg: XFree86 4.2.0) which caused a syntax error here: #if _XOPEN_SOURCE >= 600 etc.  This is a hack, but I have seen things like it around elsewhere.
Deal with "#define _XOPEN_SOURCE"  in header files (eg: XFree86 4.2.0)
which caused a syntax error here:
#if _XOPEN_SOURCE >= 600
etc.  This is a hack, but I have seen things like it around elsewhere.

Tested by:	dwcjr

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase