When building nspr I get:
make[1]: Leaving directory `/home/z/checkout/gnome2/nspr-4.8.4/lib'
*** Installing nspr *** [1/1]
make install
make -j1 -C config install
make[1]: Entering directory `/home/z/checkout/gnome2/nspr-4.8.4/config'
../config/./nsinstall -t -m 0755 nspr-config /opt/gnome2/bin
../config/./nsinstall -D /opt/gnome2/share/aclocal
../config/./nsinstall -t -m 0644 .././mozilla/nsprpub/config/nspr.m4 /opt/gnome2/share/aclocal
make[1]: *** No rule to make target `nspr.pc', needed by `install'.  Stop.
make[1]: Leaving directory `/home/z/checkout/gnome2/nspr-4.8.4/config'
make: *** [install] Error 2


It looks like the nspr.configure.patch is missing, sadly it is out of date and no longer applies properly and my attempt to revive it failed :/