According to Geoffrey Arnold:
I am looking for a gpc 2.0 binary package compiled for a Sun SPARC running Solaris 2.6 with gcc 2.7.2.3 installed in /usr/local.
In ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/binary/ you can find one for Solaris 2.5.1.
Hope this helps,
Peter