Trac 16828: Add colon to get Example block right.
Fix yet another division by zero in Fp(t)
Send include_dirs to Cython for dependency checking
Trac #16811: Polynomial_zmod_flint crashes Sage on division by zero

The following blows up instead of just raising a Python exception:

{{{
sage: F = GF(7)
sage: PF.<x> = F[]
sage: x/PF.zero()
  <BOOM>
}}}

This issue is very similar (but slightly different) to #12217.

URL: http://trac.sagemath.org/16811
Reported by: jsrn
Ticket author(s): Jeroen Demeyer
Reviewer(s): Peter Bruin
Trac #16828: Trivial change to fix doc

In `GO` of sage/groups/matrix_gps/orthogonal.py there needs to be an
extra colon for correct formatting.
Currently this is line 171. http://git.sagemath.org/sage.git/tree/src/sa
ge/groups/matrix_gps/orthogonal.py#n171

URL: http://trac.sagemath.org/16828
Reported by: kcrisman
Ticket author(s): Kannappan Sampath
Reviewer(s): Karl-Dieter Crisman
Trac #16849: Cythonizer no longer detects c_lib dependencies

While working on #16667, I noticed that the build system for Cython code
in Sage (a.k.a. `sage -b`) no longer detects `c_lib` headers as
dependency: changing `src/c_lib/include/interrupt.h` for example should
cause many files to be recompiled.

The problem seems to be that the `include_dirs` in `src/setup.py` are
sent only to distutils, not to Cython.

URL: http://trac.sagemath.org/16849
Reported by: jdemeyer
Ticket author(s): Jeroen Demeyer
Reviewer(s): Volker Braun