diff -r -U2 sympy-1.0.orig/doc/Makefile sympy-1.0/doc/Makefile
--- sympy-1.0.orig/doc/Makefile	2016-03-08 19:38:39.000000000 +0100
+++ sympy-1.0/doc/Makefile	2016-03-18 20:04:36.393615499 +0100
@@ -118,5 +118,5 @@
 	pdflatex -output-directory=_build/cheatsheet cheatsheet/cheatsheet.tex
 
-_build/cheatsheet/cheatsheet.pdf: cheatsheet/combinatoric_cheatsheet.tex
+_build/cheatsheet/combinatoric_cheatsheet.pdf: cheatsheet/combinatoric_cheatsheet.tex
 	mkdir -p _build/cheatsheet
 	pdflatex -output-directory=_build/cheatsheet cheatsheet/combinatoric_cheatsheet.tex