Linking libraries while making mex file

[Rishi Amrit]

Hi,

   I am trying compile the mex interface of ipopt (
https://projects.coin-or.org/Ipopt/wiki/MatlabInterface) to use it with
octave. Since the mex interface is written to work with Matlab, I had to
change the Makefile. After making some sensible changes in the Makefile of
the package, I was able to compile the mex file for octave, and it runs
almost perfect. After the file ipopt.mex is made, I call it from octave. It
gave me the following error:

error: libipopt.so.0: cannot open shared object file: No such file or
directory
error: failed to install .mex file function `ipopt'

Now libipopt.so.0 is present in the library path of the package (
'/opt/CoinIpopt/install/lib' in my case)

The command I used to make the mex file was:

mkoctfile --mex -L/opt/CoinIpopt/install/lib ipopt.o

My understanding was that the library path was already linked as I specified
the path in the mkoctfile command. I even tried using addpath to include the
location of the library file, but that makes no difference.

Finally the workaround that works is I set the environment variable
LD_LIBRARY_PATH to /opt/CoinIpopt/install/lib and then ipopt works perfect.
The mex file runs great.

Any ideas on what flags should I use in mkoctfile so that I dont have to set
the LD_LIBRARY_PATH variable (which I dont, when I compile the mex interface
with MATLAB).

Thanks,

Rishi
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