port octave linking error

[anddam (Andrea D'Amore)]

Building port octave on 10.7.4 gives the following error:

Undefined symbols for architecture x86_64:
  "_SuiteSparse_time", referenced from:
      _umfpack_tic in libumfpack.a(umfpack_gn_tictoc.o)
      _umfpack_toc in libumfpack.a(umfpack_gn_tictoc.o)
ld: symbol(s) not found for architecture x86_64

The issue is due to UMFPACK_LIBS provinding only -lumfpack flag and the missing symbol being defined in libSuiteSparse.dylib rather than libumfpack.a (both are from port SuiteSparse).

I'm patching UMFPACK_LIBS in Makeconf file in post-configure phase. This ticket acts as memo, I'm cc'ing original reporter on mp-user list