Linking to shared library

[trinefrisbaek]

Hi
I have a small ecosystem module with several subroutines that I would like to call from ROMS. It is written in free format and still being developed so I would like to link to this module as a shared or static library. However, I cannot get ROMS to recognize its existence.
I have added a path for my library and the modules in the build script:

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export   MY_ECO_DIR=${MY_PROJECT_DIR}/Ecosystem

In Linux_gfortran.mk I have added

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LIBS += $(MY_ECO_DIR)/libeco.so
LIBS += $(MY_ECO_DIR)/mod_eco.o

and I have tried adding

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LIBS += -L$(MY_ECO_DIR) -leco

In subroutine fennel_tile where have tried using it I write

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USE mod_eco

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biology.f90:212.10:

      USE mod_eco
          1
Fatal Error: Can't open module file 'mod_eco.mod' for reading at (1): No such file or directory 

I am clearly missing something but I cannot figure out what. I have tried linking the module to a small dummy program and it works well using

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gfortran -L. eco_main.f90 -leco -o main

Any help would be very appriciated!
Thanks

[kate]

You have already compiled your library externally? There is a mod_eco.mod file in that directory? If so, you need to tell the compiler how to find that file. Or you could copy it into the ROMS build directory, which is what is done with the netcdf.mod and friends files.

[trinefrisbaek]

Thank you Kate! The reference to netcdf.mod was just what I needed. It works now