Hi Roberto,
I may well be missing something, but it seems the life of people interfacing C/C++ and Prolog programs on MacOS would be simplified if SWI-Prolog.h and the other interface header file could be installed in some fixed place, such as /opt/local/include, as well as in /opt/local/lib/swipl-x.y.zz/include. This would match what happens on, e.g., the Linux version where these header files are installed in, say, /usr/local/include as well as in /usr/local/lib/swipl- x.y.zz/include.
On MacOS X, when installing SWI-Prolog using DarwinPorts (including the installers available from the SWI-Prolog web site), the above header files are installed on /opt/local/lib/swipl-x.y.zz/include/. A possible solution would be to create links to the header files on / opt/local/include/.
P.S. BTW, why /opt/local instead of /usr/local?
To ensure that DarwinPorts installed software does not depend or interfere with MacOS X provided software and libraries, creating a nightmare of dependencies (not to mention that upgrading MacOS X can wipe out /usr).
Cheers,
Paulo
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