OCC63 - Makefile.am:3: directory should not contain `/'

Attempting to compile occ63 on Debian Lenny/AMD64.

When I run make I get the following:
$ make
cd . && /bin/sh /opt/OpenCASCADE6.3.0/ros/make/missing --run aclocal-1.7
cd . && \
/bin/sh /opt/OpenCASCADE6.3.0/ros/make/missing --run automake-1.7 --foreign Makefile
Makefile.am:3: directory should not contain `/'
make: *** [Makefile.in] Error 1

Configured with ./configure --enable-production=yes --enable-debug=no --with-gl-library=/usr/lib --with-gl-include=/usr/include --with-java-include=/usr/java/blackdown/j2sdk1.4.2/include/ --with-xmu-library=/usr/lib --with-xmu-include=/usr/include/X11 --with-stlport-libname=stlport --with-stlport-library=/usr/lib --with-stlport-include=/usr/include/stlport --with-tcl=/usr/lib/tcl8.4 --with-tk=/usr/lib/tk8.4 --with-x=/usr/lib/X11 --prefix=/opt/occ63 --with-gnu-ld --enable-wrappers=no --enable-wok=no --enable-draw=no

versions:
GNU Make 3.81
automake (GNU automake) 1.7.9
aclocal (GNU automake) 1.7.9
autoconf (GNU Autoconf) 2.61
gcc (GCC) 4.2.3 20071123 (prerelease) (Debian 4.2.2-4)