diff -Naur autoconf-2.67/ChangeLog autoconf-2.67-magellan/ChangeLog
--- autoconf-2.67/ChangeLog	2010-07-22 00:16:44.000000000 +0200
+++ autoconf-2.67-magellan/ChangeLog	2010-08-19 21:50:24.000000000 +0200
@@ -1,3 +1,14 @@
+2010-08-14  Eric Blake  <eblake@redhat.com>
+
+	AC_INIT: allow bugreport to contain '?'
+	* lib/autoconf/general.m4 (_AC_INIT_PACKAGE): Relax check.
+	* tests/base.at (AC_INIT with unusual version strings): Enhance
+	test.
+	* doc/autoconf.texi (Initializing configure): Document this.
+	* NEWS: Likewise.
+	* THANKS: Update.
+	Reported by Yavor Doganov and others.
+
 2010-07-21  Eric Blake  <eblake@redhat.com>
 
 	Release Version 2.67.
diff -Naur autoconf-2.67/doc/autoconf.texi autoconf-2.67-magellan/doc/autoconf.texi
--- autoconf-2.67/doc/autoconf.texi	2010-07-21 23:58:24.000000000 +0200
+++ autoconf-2.67-magellan/doc/autoconf.texi	2010-08-19 21:52:00.000000000 +0200
@@ -1888,7 +1888,8 @@
 @acindex{PACKAGE_BUGREPORT}
 @ovindex PACKAGE_BUGREPORT
 @cvindex PACKAGE_BUGREPORT
-Exactly @var{bug-report}, if one was provided.
+Exactly @var{bug-report}, if one was provided.  Typically an email
+address, or URL to a bug management web page.
 
 @item @code{AC_PACKAGE_URL}, @code{PACKAGE_URL}
 @acindex{PACKAGE_URL}
diff -Naur autoconf-2.67/lib/autoconf/general.m4 autoconf-2.67-magellan/lib/autoconf/general.m4
--- autoconf-2.67/lib/autoconf/general.m4	2010-07-20 15:56:53.000000000 +0200
+++ autoconf-2.67-magellan/lib/autoconf/general.m4	2010-08-19 21:52:34.000000000 +0200
@@ -239,7 +239,7 @@
 m4_define([_AC_INIT_PACKAGE],
 [_AC_INIT_LITERAL([$1])
 _AC_INIT_LITERAL([$2])
-AS_LITERAL_IF([$3], [],  [m4_warn([syntax], [AC_INIT: not a literal: $3])])
+_AC_INIT_LITERAL([$3])
 m4_ifndef([AC_PACKAGE_NAME],
 	  [m4_define([AC_PACKAGE_NAME],     [$1])])
 m4_ifndef([AC_PACKAGE_TARNAME],
diff -Naur autoconf-2.67/NEWS autoconf-2.67-magellan/NEWS
--- autoconf-2.67/NEWS	2010-07-22 00:16:40.000000000 +0200
+++ autoconf-2.67-magellan/NEWS	2010-08-19 21:50:52.000000000 +0200
@@ -1,5 +1,8 @@
 GNU Autoconf NEWS - User visible changes.
 
+** AC_INIT again allows URLs with '?' for its BUG-REPORT argument.
+   Regression introduced in 2.66.
+
 * Major changes in Autoconf 2.67 (2010-07-21) [stable]
   Released by Eric Blake, based on git versions 2.66.*.
 
diff -Naur autoconf-2.67/tests/base.at autoconf-2.67-magellan/tests/base.at
--- autoconf-2.67/tests/base.at	2010-07-20 15:55:23.000000000 +0200
+++ autoconf-2.67-magellan/tests/base.at	2010-08-19 21:55:03.000000000 +0200
@@ -227,7 +227,7 @@
 
 AT_DATA([configure.ac],
 [[AC_INIT([GNU String++ with  spaces (foo)],
-	  [2.48++  (2010-07-03)], [http://clisp.cons.org/], [clisp])
+	  [2.48++  (2010-07-03)], [[http://example.com/?a=b&c=d#e]], [clisp])
 AC_OUTPUT
 ]])
 
@@ -239,18 +239,21 @@
 
 AT_CHECK_AUTOCONF([-Werror])
 AT_CHECK_CONFIGURE([-q])
-AT_CHECK_CONFIGURE([--help])
+AT_CHECK_CONFIGURE([--help], [], [stdout])
+AT_CHECK([[$FGREP 'com/?a=b&c=d#e' stdout]], [], [ignore])
 AT_CHECK_CONFIGURE([--version], [], [stdout])
 AT_CHECK([$FGREP 'GNU String++ with  spaces (foo)' stdout], [], [ignore])
 AT_CHECK([$FGREP '2.48++  (2010-07-03)' stdout], [], [ignore])
 
+AT_CHECK([./config.status --help], [], [stdout])
+AT_CHECK([[$FGREP 'com/?a=b&c=d#e' stdout]], [], [ignore])
 AT_CHECK([./config.status --version], [], [stdout])
 AT_CHECK([$FGREP 'GNU String++ with  spaces (foo)' stdout], [], [ignore])
 AT_CHECK([$FGREP '2.48++  (2010-07-03)' stdout], [], [ignore])
 
 AT_DATA([configure.ac],
 [[AC_INIT([GNU "String++"],
-	  [2.48], [http://clisp.cons.org/], [clisp])
+	  [2.48], [http://example.com/], [clisp])
 AC_OUTPUT
 ]])
 
@@ -259,7 +262,7 @@
 
 AT_DATA([configure.ac],
 [[AC_INIT([GNU String++],
-	  ['codename' 2.48], [http://clisp.cons.org/], [clisp])
+	  ['codename' 2.48], [http://example.com/], [clisp])
 AC_OUTPUT
 ]])
 
@@ -268,7 +271,7 @@
 
 AT_DATA([configure.ac],
 [[AC_INIT([GNU
-String++], [2.48], [http://clisp.cons.org/], [clisp])
+String++], [2.48], [http://example.com/], [clisp])
 AC_OUTPUT
 ]])
 
diff -Naur autoconf-2.67/THANKS autoconf-2.67-magellan/THANKS
--- autoconf-2.67/THANKS	2010-05-12 16:34:40.000000000 +0200
+++ autoconf-2.67-magellan/THANKS	2010-08-19 21:51:14.000000000 +0200
@@ -406,6 +406,7 @@
 Wilfredo Sanchez            wsanchez@apple.com
 William Pursell             bill.pursell@gmail.com
 Wolfgang Mueller            Wolfgang.Mueller@cui.unige.ch
+Yavor Doganov               yavor@gnu.org
 Yury Puhalsky               pooh@cryptopro.ru
 Zack Weinberg               zack@codesourcery.com
 ?                           Seanster@Seanster.com