fix Cython installation, make compilation obligatory (unless explicitly disabled) and abort the installation if the compilation fails
fix Cython installation, make compilation obligatory (unless explicitly disabled) and abort the installation if the compilation fails

andreasvc/cython,fabianrost84/cython,mcanthony/cython,ABcDexter/cython,fperez/cython,roxyboy/cython,mrGeen/cython,mrGeen/cython,mcanthony/cython,acrispin/cython,mcanthony/cython,da-woods/cython,da-woods/cython,mcanthony/cython,encukou/cython,fabianrost84/cython,acrispin/cython,hhsprings/cython,rguillebert/CythonCTypesBackend,encukou/cython,marscher/cython,hickford/cython,achernet/cython,dahebolangkuan/cython,fabianrost84/cython,ABcDexter/cython,slonik-az/cython,marscher/cython,andreasvc/cython,acrispin/cython,hpfem/cython,encukou/cython,hhsprings/cython,madjar/cython,bzzzz/cython,JelleZijlstra/cython,cython/cython,dahebolangkuan/cython,andreasvc/cython,encukou/cython,hickford/cython,fperez/cython,da-woods/cython,ABcDexter/cython,mcanthony/cython,hpfem/cython,larsmans/cython,ChristopherHogan/cython,hickford/cython,bzzzz/cython,madjar/cython,fperez/cython,slonik-az/cython,achernet/cython,larsmans/cython,roxyboy/cython,hickford/cython,cython/cython,fperez/cython,hpfem/cython,acrispin/cython,ABcDexter/cython,rguillebert/CythonCTypesBackend,hhsprings/cython,slonik-az/cython,c-blake/cython,marscher/cython,JelleZijlstra/cython,ABcDexter/cython,hpfem/cython,roxyboy/cython,bzzzz/cython,achernet/cython,mrGeen/cython,marscher/cython,ChristopherHogan/cython,da-woods/cython,larsmans/cython,madjar/cython,c-blake/cython,scoder/cython,encukou/cython,roxyboy/cython,cython/cython,slonik-az/cython,mrGeen/cython,dahebolangkuan/cython,JelleZijlstra/cython,hhsprings/cython,madjar/cython,JelleZijlstra/cython,hhsprings/cython,madjar/cython,fabianrost84/cython,marscher/cython,dahebolangkuan/cython,mrGeen/cython,rguillebert/CythonCTypesBackend,fperez/cython,cython/cython,andreasvc/cython,rguillebert/CythonCTypesBackend,larsmans/cython,dahebolangkuan/cython,larsmans/cython,hickford/cython,achernet/cython,achernet/cython,fabianrost84/cython,c-blake/cython,JelleZijlstra/cython,roxyboy/cython,c-blake/cython,c-blake/cython,hpfem/cython,bzzzz/cython,scoder/cython,scoder/cython,acrispin/cython,ChristopherHogan/cython,slonik-az/cython,andreasvc/cython,scoder/cython