<div id="comment:0"></div> The solution is to add 'sage_fortran' to the beginning of the list of fortran compilers on the cygwin line in src/numpy/distutils/fcompiler/__init__.py CC: @williamstein Component: **porting: Cygwin** Author: **Mike Hansen** Reviewer: **Peter Jeremy, William Stein** Merged: **sage-4.4.1.alpha2** _Issue created by migration from https://trac.sagemath.org/ticket/7321_