+# Check if we have a version mismatch between libtool.m4 and ltmain.sh.
+#
+# Note: This should be in AC_LIBTOOL_SETUP, _after_ $ltmain have been defined.
+# We also should do it _before_ AC_LIBTOOL_LANG_C_CONFIG that actually
+# calls AC_LIBTOOL_CONFIG and creates libtool.
+#
+{ echo "$as_me:$LINENO: checking for correct ltmain.sh version" >&5
+echo $ECHO_N "checking for correct ltmain.sh version... $ECHO_C" >&6; }
+if test "x$ltmain" = "x" ; then
+ { echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+ { { echo "$as_me:$LINENO: error:
+
+*** [Gentoo] sanity check failed! ***
+*** \$ltmain is not defined, please check the patch for consistency! ***
+" >&5
+echo "$as_me: error:
+
+*** [Gentoo] sanity check failed! ***
+*** \$ltmain is not defined, please check the patch for consistency! ***
+" >&2;}
+ { (exit 1); exit 1; }; }
+fi
+gentoo_lt_version="1.5.24"
+gentoo_ltmain_version=`sed -n '/^[ ]*VERSION=/{s/^[ ]*VERSION=//;p;q;}' "$ltmain"`
+if test "x$gentoo_lt_version" != "x$gentoo_ltmain_version" ; then
+ { echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+ { { echo "$as_me:$LINENO: error:
+
+*** [Gentoo] sanity check failed! ***
+*** libtool.m4 and ltmain.sh have a version mismatch! ***
+*** (libtool.m4 = $gentoo_lt_version, ltmain.sh = $gentoo_ltmain_version) ***
+
+Please run:
+
+ libtoolize --copy --force
+
+if appropriate, please contact the maintainer of this
+package (or your distribution) for help.
+" >&5
+echo "$as_me: error:
+
+*** [Gentoo] sanity check failed! ***
+*** libtool.m4 and ltmain.sh have a version mismatch! ***
+*** (libtool.m4 = $gentoo_lt_version, ltmain.sh = $gentoo_ltmain_version) ***
+
+Please run:
+
+ libtoolize --copy --force
+
+if appropriate, please contact the maintainer of this
+package (or your distribution) for help.
+" >&2;}
+ { (exit 1); exit 1; }; }
+else
+ { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+fi
+
+