Run simple cd.sh script. Output is in attached out.txt. The traceback shows that somehow (magical bits?) the base distribution /lib/libgcc_s.so.1 is used when the fortran.so library RPATH clearly states the GCC_4.6 library should be used.

Traceback (most recent call last):
  File "ab.py", line 1, in <module>
    from numpy import *
  File "/usr/local/lib/python2.7/site-packages/numpy/__init__.py", line 137, in <module>
    import add_newdocs
  File "/usr/local/lib/python2.7/site-packages/numpy/add_newdocs.py", line 9, in <module>
    from numpy.lib import add_newdoc
  File "/usr/local/lib/python2.7/site-packages/numpy/lib/__init__.py", line 13, in <module>
    from polynomial import *
  File "/usr/local/lib/python2.7/site-packages/numpy/lib/polynomial.py", line 17, in <module>
    from numpy.linalg import eigvals, lstsq, inv
  File "/usr/local/lib/python2.7/site-packages/numpy/linalg/__init__.py", line 48, in <module>
    from linalg import *
  File "/usr/local/lib/python2.7/site-packages/numpy/linalg/linalg.py", line 23, in <module>
    from numpy.linalg import lapack_lite
ImportError: /lib/libgcc_s.so.1: version GCC_4.6.0 required by /usr/local/gcc-aux/lib/libgfortran.so.3 not found
LDD /usr/local/gcc-aux/lib/libgfortran.so.3

Fix: unknown. Hopefully not just a simple configuration issue!

Patch attached with submission follows:
How-To-Repeat: run script cd.sh

BEGIN SCRIPT
#!/bin/sh

pkg_info -x numpy
pkg_info -x gcc-aux
pkg_info -x python27

cat<<EOF>ab.sh
#!/bin/sh

export LD_LIBRARY_PATH="/usr/local/lib"
python ab.py
exit
EOF
chmod +x ab.sh
./ab.sh

SHLIBS="\
 /usr/local/gcc-aux/lib/libgfortran.so.3 \
 /usr/local/gcc-aux/lib/libgfortran.so \
"

for f in $SHLIBS; do
    echo "LDD $f"
    ldd $f
    echo "CHRPATH $f"
    chrpath -l $f
done


echo "0000000"
objdump -p /usr/local/gcc-aux/lib/libgcc_s.so.1
echo "1111111"
objdump -p /lib/libgcc_s.so.1

END SCRIPT