diff --git a/config-daemon.ac b/config-daemon.ac
index 50ead355a8..19958d331b 100644
--- a/config-daemon.ac
+++ b/config-daemon.ac
@@ -13,7 +13,7 @@ if test "x$guix_build_daemon" = "xyes"; then
   GUIX_ASSERT_CXX11
 
   AC_PROG_RANLIB
-  AC_CONFIG_HEADER([nix/config.h])
+  AC_CONFIG_HEADERS([nix/config.h])
 
   dnl Use 64-bit file system calls so that we can support files > 2 GiB.
   AC_SYS_LARGEFILE
diff --git a/configure.ac b/configure.ac
index 942e84164a..a5bdf24e93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ(2.68)
+AC_PREREQ([2.69])
 AC_INIT([GNU Guix],
   [m4_esyscmd([build-aux/git-version-gen .tarball-version])],
   [bug-guix@gnu.org], [guix],
@@ -29,35 +29,35 @@ GUIX_ASSERT_SUPPORTED_SYSTEM
 AM_CONDITIONAL([CROSS_COMPILING], [test "x$cross_compiling" = "xyes"])
 
 AC_ARG_WITH(store-dir,
-  AC_HELP_STRING([--with-store-dir=PATH],
+  AS_HELP_STRING([--with-store-dir=PATH],
     [file name of the store (defaults to /gnu/store)]),
   [storedir="$withval"],
   [storedir="/gnu/store"])
 AC_SUBST(storedir)
 
 AC_ARG_WITH([bash-completion-dir],
-  AC_HELP_STRING([--with-bash-completion-dir=DIR],
+  AS_HELP_STRING([--with-bash-completion-dir=DIR],
     [name of the Bash completion directory]),
   [bashcompletiondir="$withval"],
   [bashcompletiondir='${sysconfdir}/bash_completion.d'])
 AC_SUBST([bashcompletiondir])
 
 AC_ARG_WITH([zsh-completion-dir],
-  AC_HELP_STRING([--with-zsh-completion-dir=DIR],
+  AS_HELP_STRING([--with-zsh-completion-dir=DIR],
     [name of the Zsh completion directory]),
   [zshcompletiondir="$withval"],
   [zshcompletiondir='${datadir}/zsh/site-functions'])
 AC_SUBST([zshcompletiondir])
 
 AC_ARG_WITH([fish-completion-dir],
-  AC_HELP_STRING([--with-fish-completion-dir=DIR],
+  AS_HELP_STRING([--with-fish-completion-dir=DIR],
     [name of the Fish completion directory]),
   [fishcompletiondir="$withval"],
   [fishcompletiondir='${datadir}/fish/vendor_completions.d'])
 AC_SUBST([fishcompletiondir])
 
 AC_ARG_WITH([selinux-policy-dir],
-  AC_HELP_STRING([--with-selinux-policy-dir=DIR],
+  AS_HELP_STRING([--with-selinux-policy-dir=DIR],
     [name of the SELinux policy directory]),
   [selinux_policydir="$withval"],
   [selinux_policydir='${datadir}/selinux/'])
diff --git a/m4/guix.m4 b/m4/guix.m4
index 4fa7cdf737..f8eb5aaf51 100644
--- a/m4/guix.m4
+++ b/m4/guix.m4
@@ -26,7 +26,7 @@ AC_DEFUN([GUIX_SYSTEM_TYPE], [
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_PATH_PROG([SED], [sed])
 
-  AC_ARG_WITH(system, AC_HELP_STRING([--with-system=SYSTEM],
+  AC_ARG_WITH(system, AS_HELP_STRING([--with-system=SYSTEM],
     [Platform identifier (e.g., `i686-linux').]),
     [guix_system="$withval"],
     [case "$host_cpu" in
@@ -78,7 +78,7 @@ dnl Assert that this is a system to which the distro is ported.
 AC_DEFUN([GUIX_ASSERT_SUPPORTED_SYSTEM], [
   AC_REQUIRE([GUIX_SYSTEM_TYPE])
 
-  AC_ARG_WITH([courage], [AC_HELP_STRING([--with-courage],
+  AC_ARG_WITH([courage], [AS_HELP_STRING([--with-courage],
     [Assert that even if this platform is unsupported, you will be
 courageous and port the GNU System distribution to it (see
 "GNU Distribution" in the manual.)])],