diff --git a/.cvsignore b/.cvsignore
index e71f975..da73a07 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -1 +1 @@
-autoconf-2.65.tar.xz
+autoconf-2.66.tar.xz
diff --git a/autoconf.spec b/autoconf.spec
index 854e800..badf2f0 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -1,21 +1,17 @@
 Summary:    A GNU tool for automatically configuring source code
 Name:       autoconf
-Version:    2.65
-Release:    2%{?dist}
+Version:    2.66
+Release:    1%{?dist}
 License:    GPLv2+ and GFDL
 Group:      Development/Tools
-Source:     http://ftp.gnu.org/gnu/autoconf/autoconf-%{version}.tar.xz
+Source:     http://ftpmirror.gnu.org/autoconf/autoconf-%{version}.tar.xz
 URL:        http://www.gnu.org/software/autoconf/
 BuildArch: noarch
 BuildRoot:  %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
-# Make AC_FUNC_MMAP work with C++ again.
-# Committed to Autoconf git soon after 2.65.
-Patch1: autoconf_ac_func_mmap.patch
-
-# m4 >= 1.4.6 is required, >= 1.4.13 is recommended:
-BuildRequires:      m4 >= 1.4.13
-Requires:           m4 >= 1.4.13
+# m4 >= 1.4.6 is required, >= 1.4.14 is recommended:
+BuildRequires:      m4 >= 1.4.14
+Requires:           m4 >= 1.4.14
 BuildRequires:      emacs
 # the filtering macros are currently in /etc/rpm/macros.perl:
 BuildRequires:      perl-devel
@@ -54,7 +50,6 @@ their use.
 
 %prep
 %setup -q
-%patch1 -p1
 
 %build
 %configure
@@ -63,10 +58,10 @@ make
 
 %check
 # The following test is failing.
-# 188: autotest.at:1195   parallel autotest and signal handling
+# 199: autotest.at  parallel autotest and signal handling
 # In test/autotest.at, under comment "Test PIPE", the exit code written
 # to file "status" is 0.  Report mailed to bug-autoconf.
-make check TESTSUITEFLAGS='-187 189-'
+make check TESTSUITEFLAGS='-198 200-'
 
 %install
 rm -rf ${RPM_BUILD_ROOT}
@@ -98,6 +93,9 @@ fi
 %doc AUTHORS COPYING ChangeLog NEWS README THANKS TODO
 
 %changelog
+* Mon Jul  5 2010 Stepan Kasal <kasal@ucw.cz> - 2.66-1
+- new upstream version, drop upstreamed patches
+
 * Tue Mar  2 2010 Stepan Kasal <skasal@redhat.com> - 2.65-2
 - use perl filtering macros
 
diff --git a/autoconf_ac_func_mmap.patch b/autoconf_ac_func_mmap.patch
deleted file mode 100644
index 46fe1b1..0000000
--- a/autoconf_ac_func_mmap.patch
+++ /dev/null
@@ -1,61 +0,0 @@
-2009-11-24  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
- 
-	Fix AC_FUNC_MMAP regression with C++ compiler in 2.65.
-	* lib/autoconf/functions.m4 (AC_FUNC_MMAP): Use const char*
-	for the constant string.  Cast void* to char* for assignment.
-	* NEWS, THANKS: Update.
-	Report by Michal Čihař.
-
-diff --git a/NEWS b/NEWS
-index b72eb17..32fa957 100644
---- a/NEWS
-+++ b/NEWS
-@@ -1,5 +1,10 @@
- GNU Autoconf NEWS - User visible changes.
- 
-+* Major changes in Autoconf 2.65a (????-??-??) [experimental]
-+  Released by ???? ????
-+
-+** AC_FUNC_MMAP works in C++ mode again.  Regression introduced in 2.64.
-+
- * Major changes in Autoconf 2.65 (2009-11-21) [stable]
-   Released by Eric Blake, based on git versions 2.64.*.
- 
-diff --git a/THANKS b/THANKS
-index b288163..fdd6930 100644
---- a/THANKS
-+++ b/THANKS
-@@ -250,6 +250,7 @@ Matthew D. Langston         langston@SLAC.Stanford.EDU
- Matthew Mueller             donut@azstarnet.com
- Matthew Woehlke             mw_triad@users.sourceforge.net
- Matthias Andree             matthias.andree@gmx.de
-+Michal Čihař                nijel@debian.org
- Michael Elizabeth Chastain  chastain@cygnus.com
- Michael Jenning             ?
- Michael Matz                matz@kde.org
-diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
-index 6b6e7fc..14a8cb9 100644
---- a/lib/autoconf/functions.m4
-+++ b/lib/autoconf/functions.m4
-@@ -1258,6 +1258,7 @@ int
- main ()
- {
-   char *data, *data2, *data3;
-+  const char *cdata2;
-   int i, pagesize;
-   int fd, fd2;
- 
-@@ -1282,10 +1283,10 @@ main ()
-   fd2 = open ("conftest.txt", O_RDWR | O_CREAT | O_TRUNC, 0600);
-   if (fd2 < 0)
-     return 4;
--  data2 = "";
--  if (write (fd2, data2, 1) != 1)
-+  cdata2 = "";
-+  if (write (fd2, cdata2, 1) != 1)
-     return 5;
--  data2 = mmap (0, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd2, 0L);
-+  data2 = (char *) mmap (0, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd2, 0L);
-   if (data2 == MAP_FAILED)
-     return 6;
-   for (i = 0; i < pagesize; ++i)
diff --git a/sources b/sources
index f5c6062..8ccc1e5 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-dfb23a46ecb73a0abade39c053a6c5a1  autoconf-2.65.tar.xz
+adbe7e7fde3c34a400d33a8ac631c877  autoconf-2.66.tar.xz