Parallel build bug?

[Joakim Tjernlund]

 make clean
 make -s -j6 all
 make clean
 make -s -j6 install
Works fine but:
 make clean
 make -s -j6 all install
ends up with a:
 mv: cannot stat `.deps/libeq_mib_if_a-eq_mib_equipment.Tpo': No such file or 
directory
 make[1]: *** [libeq_mib_if_a-eq_mib_equipment.o] Error 1
 make[1]: *** Waiting for unfinished jobs....
appears to me that there is some
dependency missing so that both targets is run in parallel.
Is this expected behaviour or a bug?

      Jocke