diff -rup gcc-4.6.4/gcc/Makefile.in gcc-4.6.4.new/gcc/Makefile.in
--- gcc-4.6.4/gcc/Makefile.in	2013-04-01 10:32:34.000000000 +0200
+++ gcc-4.6.4.new/gcc/Makefile.in	2016-11-10 11:00:52.771345965 +0100
@@ -4261,18 +4261,10 @@ doc/gcc.info: $(TEXI_GCC_FILES)
 doc/gccint.info: $(TEXI_GCCINT_FILES)
 doc/cppinternals.info: $(TEXI_CPPINT_FILES)
 
-doc/%.info: %.texi
-	if [ x$(BUILD_INFO) = xinfo ]; then \
-		$(MAKEINFO) $(MAKEINFOFLAGS) -I . -I $(gcc_docdir) \
-			-I $(gcc_docdir)/include -o $@ $<; \
-	fi
+doc/%.info:
 
 # Duplicate entry to handle renaming of gccinstall.info
-doc/gccinstall.info: $(TEXI_GCCINSTALL_FILES)
-	if [ x$(BUILD_INFO) = xinfo ]; then \
-		$(MAKEINFO) $(MAKEINFOFLAGS) -I $(gcc_docdir) \
-			-I $(gcc_docdir)/include -o $@ $<; \
-	fi
+doc/gccinstall.info:
 
 doc/cpp.dvi: $(TEXI_CPP_FILES)
 doc/gcc.dvi: $(TEXI_GCC_FILES)