python - Compilation error ld: library not found for -lgcc_ext in MacOSX -

1. i'm trying replicate tutorial example in pylearn2 documentation. when run python make_dataset.py, in example, got error:

   11:17 $ python make_dataset.py  /users/user/pylearn2/pylearn2/utils/image.py:16: userwarning: unable import matplotlib. features unavailable. original exception: dlopen(/library/python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/backends/_macosx.so, 2): symbol not found: __cg_jpeg_resync_to_restart 

   referenced from: /system/library/frameworks/imageio.framework/versions/a/imageio

   expected in: /usr/local/lib/libjpeg.8.dylib

   i can import matplotlib , image in python in command line. me understand complaining , how fix error?

2. another problem (which may or may not related problem above) linking error

   problem occurred during compilation command line below:

   g++ -dynamiclib -g -o3 -fno-math-errno -wno-unused-label -wno-unused-variable -wno-write-strings -march=core-avx-i -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mno-movbe -maes -mpclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mavx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rtm -mno-hle -mrdrnd -mf16c -mfsgsbase -mno-rdseed -mno-prfchw -mno-adx -mfxsr -mxsave -mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=6144 -mtune=core-avx-i -d npy_no_deprecated_api=npy_1_7_api_version -m64 -fpic -undefined dynamic_lookup -i/library/python/2.7/site-packages/numpy-1.9.0.dev_297f54b-py2.7-macosx-10.9-intel.egg/numpy/core/include -i/system/library/frameworks/python.framework/versions/2.7/include/python2.7 -o /users/user/.theano/compiledir_darwin-13.2.0-x86_64-i386-64bit-i386-2.7.5-64/tmpbdy9w9/49d70155ef39a124cbfa83c600416644.so /users/user/.theano/compiledir_darwin-13.2.0-x86_64-i386-64bit-i386-2.7.5-64/tmpbdy9w9/mod.cpp -l/system/library/frameworks/python.framework/versions/2.7/lib  ld: library not found -lgcc_ext.10.5  collect2: error: ld returned 1 exit status  exception: ('the following error happened while compiling node', inplacedimshuffle{x,0}(mean), '\n', 'compilation failed (return status=1): ld: library not found -lgcc_ext.10.5. collect2: error: ld returned 1 exit status. ', '[inplacedimshuffle{x,0}(mean)]') 

   i running pylearn2 on mac osx mavericks. not sure how fix error: library seems in system in several places:

   /usr/local/cellar/gcc47/4.7.3/lib/gcc/x86_64-apple-darwin13.0.0/4.7.3/libgcc_ext.10.5.dylib /usr/local/cellar/gfortran/4.8.2/gfortran/lib/libgcc_ext.10.5.dylib /usr/local/lib/gcc/x86_64-apple-darwin13.0.0/4.7.3/libgcc_ext.10.5.dylib 

   i not sure 1 link , how should link.

   i have changed (added) paths dyld_library_path didn't fix problem.

   any appreciated.

it looks one possible solution manually create link .dylib file:

sudo ln -sf /system/library/frameworks/opengl.framework/versions/a/libraries/libgl.dylib /opt/local/lib/libgl.dylib

sudo ln -sf /system/library/frameworks/applicationservices.framework/versions/a/frameworks/imageio.framework/versions/a/resources/libpng.dylib /opt/local/lib/libpng.dylib

sudo ln -sf /system/library/frameworks/applicationservices.framework/versions/a/frameworks/imageio.framework/versions/a/resources/libtiff.dylib /opt/local/lib/libtiff.dylib

sudo ln -sf /system/library/frameworks/applicationservices.framework/versions/a/frameworks/imageio.framework/versions/a/resources/libjpeg.dylib /opt/local/lib/libjpeg.dylib

why work? because whatever reason, when apple requests libjpeg.dyld, whatever system searches finds /opt/local/lib/libjpeg.dyld because search case insensitive. unix operating system. go figure. lines above force program looking libjpeg.dyld redirected apple's libjpeg.dyld.

another user suggested setting dyld_fallback_library_path:

you use dyld_fallback_library_path. had use avoid apple's libjpeg getting in way of apps expected libjpeg port. see man page dlopen() details.