makeinfo 5+ cannot build gcc 4.6.3. This patch updates the version check to
require makeinfo 4 or skip building info docs.
Index: gcc-4.6.4/configure
===================================================================
--- gcc-4.6.4.orig/configure	2014-05-09 14:57:33.673419890 -0400
+++ gcc-4.6.4/configure	2014-05-09 14:57:33.669419931 -0400
@@ -8016,7 +8016,7 @@
     # For an installed makeinfo, we require it to be from texinfo 4.7 or
     # higher, else we use the "missing" dummy.
     if ${MAKEINFO} --version \
-       | egrep 'texinfo[^0-9]*(4\.([7-9]|[1-9][0-9])|[5-9]|[1-9][0-9])' >/dev/null 2>&1; then
+       | egrep 'texinfo[^0-9]*4\.([7-9]|[1-9][0-9])' >/dev/null 2>&1; then
       :
     else
       MAKEINFO="$MISSING makeinfo"
Index: gcc-4.6.4/configure.ac
===================================================================
--- gcc-4.6.4.orig/configure.ac	2014-05-09 14:57:33.673419890 -0400
+++ gcc-4.6.4/configure.ac	2014-05-09 14:57:33.673419890 -0400
@@ -3243,7 +3243,7 @@
     # For an installed makeinfo, we require it to be from texinfo 4.7 or
     # higher, else we use the "missing" dummy.
     if ${MAKEINFO} --version \
-       | egrep 'texinfo[^0-9]*(4\.([7-9]|[1-9][0-9])|[5-9]|[1-9][0-9])' >/dev/null 2>&1; then
+       | egrep 'texinfo[^0-9]*4\.([7-9]|[1-9][0-9])' >/dev/null 2>&1; then
       :
     else
       MAKEINFO="$MISSING makeinfo"