Add autoconf 2.13.

SHA256SUMS.sources

@@ -1,3 +1,4 @@
+f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e  autoconf-2.13.tar.gz
 534e99b61b81e79327b6d08f1a3edb0755ac246e1249009b0e1bf5887b60d7a9  autoconf-2.52.tar.gz
 503cdc2b0992a4309545d17f462cb15f99bb57b7161dfc4082b2e7188f2bcc0f  automake-1.4-p6.tar.gz
 ba03d412998cc54bd0b0f2d6c32100967d3137098affdc2d32e6e7c11b163fe4  bash-2.05b.tar.gz

parts.rst

@@ -382,3 +382,8 @@ autoconf 2.52
 =============
 
 We now properly rebuild ``autoconf`` using ``autoconf`` and ``automake``.
+
+autoconf 2.13
+=============
+
+Different versions of autotools are not fully compatible, so build older ``autoconf`` too.

rootfs.sh

@@ -207,6 +207,9 @@ get_file https://ftp.gnu.org/gnu/autoconf/autoconf-2.52.tar.gz
 # automake 1.4-p6
 get_file https://ftp.gnu.org/gnu/automake/automake-1.4-p6.tar.gz
 
+# autoconf 2.13
+get_file https://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz
+
 # General cleanup
 find tmp -name .git -exec rm -rf \;
 

sysa/autoconf-2.13/autoconf-2.13.sh

@@ -0,0 +1,14 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    rm configure
+    autoconf-2.52
+
+    sed -i '/^acdatadir/s:$:-2.13:' Makefile.in
+}
+
+src_configure() {
+    ./configure --prefix=${PREFIX} --program-suffix=-2.13
+}

sysa/run.sh

@@ -75,4 +75,6 @@ build automake-1.4-p6 stage2.sh
 
 build autoconf-2.52 stage2.sh
 
+build autoconf-2.13
+
 echo "Bootstrapping completed."