To build Open H.323 see: 

http://www.openh323.org/build.html#unix

You only need to do 'make opt'. Anything else you will be simply waisting time and HD space.
Also, you will notice they never tell you to 'make install' so don't do it.


On FreeBSD, the Makefiles are configured to
locate the compiled openh323 port, if it has
been built.  Here is one way to build
openh323 and ptlib on such that the Makefiles
find it:
	# cd /usr/ports/net/openh323
	# make
It is not necessary to install the port.  The
asterisk makefiles do not use any files
installed by the port.