CXX=aCC CC=cc ./configure --prefix=/usr/local
gmake
gmake install
gmake distclean
CXX=g++ CC=gcc ./configure --prefix=/usr/local --libdir=/usr/local/lib/pa20_64 --bindir=/usr/local/bin/pa20_64
gmake
gmake install

mv /usr/local/bin/tar /usr/local/bin/gtar
mv /usr/local/bin/pa20_64/tar /usr/local/bin/pa20_64/gtar