Compilation problem with "import model_v4"

Hello:

I'm using MG5v1.4.4 and trying to import a custom heft model via "import model_v4", using Mac OSX 10.6.8. When I run generate_events I get the error:

make[1]: *** No rule to make target `couplings_test.o', needed by `../../lib/libmodel.a'. Stop.
make: *** [../lib/libmodel.a] Error 2

If I follow the advice in https://answers.launchpad.net/madgraph5/+question/169739 and run "change_compiler.py gfortran", I get the same error. If I go to the Source directory and rm all .o files and run make, everything compiles fine until it gets to the MODEL directory:

{. . . . .}
gfortran -O -w -ffixed-line-length-132 -c -o pdf.o pdf.f
gfortran -O -w -ffixed-line-length-132 -c -o PhotonFlux.o PhotonFlux.f
gfortran -O -w -ffixed-line-length-132 -c -o pdg2pdf.o pdg2pdf.f
ar cru ../../lib/libpdf.a Ctq4Fn.o Ctq5Par.o Ctq5Pdf.o Partonx5.o Ctq6Pdf.o cteq3.o mrs98.o mrs98lo.o mrs98ht.o mrs99.o mrst2001.o mrst2002.o jeppe02.o pdfwrap.o opendata.o pdf.o PhotonFlux.o pdg2pdf.o
ranlib ../../lib/libpdf.a
cd MODEL; make
make[1]: *** No rule to make target `couplings_test.o', needed by `../../lib/libmodel.a'. Stop.
make: *** [../lib/libmodel.a] Error 2

The same error occurs when I use g77 instead of gfortran, whether via change_compiler.py or by manually changing the makefile. Can someone perhaps point me in the right direction?

Thanks in advance for any help you can offer.

--James