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Serial Port communications on Mac via Matlab

I have a rev B (Core 2 Duo from Dec, 2006) Apple MacBook Pro laptop running Leopard OS X (version 10.5.2) and have Matlab version 7.5.0.338 (R2007b). I’ve just found that I can NOT use the built-in serial port object, instead, I get the following error:
java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver
??? [...]

Getting tcl via macports to compile on Leopard

With a fresh install of MacPorts version 1.6.0 on Mac OS X 10.5.2 Leopard, then issuing the command:
sudo port install tcl
returned:
/usr/local/include/mach-o/arch.h:35: error: nested redefinition of ‘enum NXByteOrder’
/usr/local/include/mach-o/arch.h:35: error: redeclaration of ‘enum NXByteOrder’
/usr/local/include/mach-o/arch.h:36: error: redeclaration of enumerator ‘NX_UnknownByteOrder’
/usr/include/architecture/byte_order.h:137: error: previous definition of ‘NX_UnknownByteOrder’ was here
/usr/local/include/mach-o/arch.h:37: error: redeclaration of enumerator ‘NX_LittleEndian’
/usr/include/architecture/byte_order.h:138: error: previous definition of [...]