Sorry, but I even fail to install Free Pascal. According to the instructions (e.g. from http://www.freepascal.org/down/i386/solaris-austria.var the archive comes with an install script, but it doesn't. Manually copying the files doesn't work, as expected.
You just need only the latest (open)Solaris ppc binary, just the compiler itself!, provided you have the toolchain installed (like build-essential and the GNU compiler suite) and build fpc with "make clean all install PP=/the/path/to/your/ppc/ppc386"