# %cython in notebook doesn’t work anymore

hello,

running sage-6.3.app on macosx 10.9.5, i can’t use %cython in the notebook anymore (it used to work some time ago though, with older sage and system versions);

i get the following: *error: command 'gcc' failed with exit status 1*

more precisely, gcc doesn’t find a certain file limits.h (see details below) that, however, exists at the given address - i checked it;

how can i make it work again?

PS: same gcc error when loading a .spyx file in the command line

PS2: same errors with the 6.4 version (sage-6.4-x86_64-Darwin-OSX_10.9_x86_64.dmg)

```
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -I/Applications/Sage-6.3.app/Contents/Resources/sage/local/include/csage -I/Applications/Sage-6.3.app/Contents/Resources/sage/local/include -I/Applications/Sage-6.3.app/Contents/Resources/sage/local/include/python2.7 -I/Applications/Sage-6.3.app/Contents/Resources/sage/local/lib/python/site-packages/numpy/core/include -I/Applications/Sage-6.3.app/Contents/Resources/sage/src/sage/ext -I/Applications/Sage-6.3.app/Contents/Resources/sage/src -I/Applications/Sage-6.3.app/Contents/Resources/sage/src/sage/gsl -I/Users/fabrice/.sage/sage_notebook.sagenb/home/admin/123/code -I/Applications/Sage-6.3.app/Contents/Resources/sage/local/include/python2.7 -c _Users_fabrice__sage_sage_notebook_sagenb_home_admin_123_code_sage2_spyx_0.c -o build/temp.macosx-10.9-x86_64-2.7/_Users_fabrice__sage_sage_notebook_sagenb_home_admin_123_code_sage2_spyx_0.o -w -O2
In file included from /Applications/Sage-6.3.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin13.3.0/4.7.3/include-fixed/syslimits.h:7:0,
from /Applications/Sage-6.3.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin13.3.0/4.7.3/include-fixed/limits.h:34,
from /Applications/Sage-6.3.app/Contents/Resources/sage/local/include/python2.7/Python.h:19,
from _Users_fabrice__sage_sage_notebook_sagenb_home_admin_123_code_sage2_spyx_0.c:16:
/Applications/Sage-6.3.app/Contents/Resources/sage/local/bin/../lib/gcc/x86_64-apple-darwin13.3.0/4.7.3/include-fixed/limits.h:169:61: fatal error: limits.h: No such file or directory
compilation terminated.
```

Does it work in the command line? (I mean does Cython at all work?) Since you have 6.3, https://github.com/sagemath/sagenb/issues/260 should not be relevant to you. It's also possible that there is some incompleteness from the compiled binary to your specific platform.

In the command line, i can load a .sage file but not a .spyx file, for the very same reason as above (same gcc failed error message)