It is just apt-get source gnuplot/testing ; cat debian/rules | sed -e 's/--with-gd/--with-gd --with-bitmap-terminals' > debian-rules ; dpkg-buildpackage . (or s

It is just apt-get source gnuplot/testing ; cat debian/rules | sed -e 's/--with-gd/--with-gd --with-bitmap-terminals' > debian-rules ; dpkg-buildpackage . (or something approximately like that) But you are welcome to apt-get build-deb and do that by yourself if you don't trust my binaries or my memory :-)