diff -r -U2 sympy-0.7.6.orig/doc/Makefile sympy-0.7.6/doc/Makefile
--- sympy-0.7.6.orig/doc/Makefile	2014-11-21 02:00:41.000000000 +0600
+++ sympy-0.7.6/doc/Makefile	2014-12-07 20:49:01.091613474 +0600
@@ -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