Unetdb is located in:
unix/src/ibm-4-3/Unetdb.m3
unix/src/osf-1.generic/Unetdb.m3
unix/src/ultrix-3-1.generic/Unetdb.m3
unix/src/solaris-2-x/Unetdb.m3
unix/src/freebsd-1/Unetdb.m3
unix/src/sunos-4-x/Unetdb.m3
unix/src/freebsd-2/Unetdb.m3
unix/src/linux/Unetdb.m3
unix/src/irix-5.2/Unetdb.m3
unix/src/aix-ps2-1-2/Unetdb.m3
unix/src/aix-3-2/Unetdb.m3
unix/src/sysv-4.0/Unetdb.m3