diff --git a/SHA256SUMS.sources b/SHA256SUMS.sources
index 1b72422..a5951f9 100644
--- a/SHA256SUMS.sources
+++ b/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
diff --git a/parts.rst b/parts.rst
index 7dbb5bd..c8709bd 100644
--- a/parts.rst
+++ b/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.
diff --git a/rootfs.sh b/rootfs.sh
index b234d77..91ae5b6 100755
--- a/rootfs.sh
+++ b/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 \;
 
diff --git a/sysa/autoconf-2.13/autoconf-2.13.sh b/sysa/autoconf-2.13/autoconf-2.13.sh
new file mode 100755
index 0000000..b94c0ae
--- /dev/null
+++ b/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
+}
diff --git a/sysa/autoconf-2.13/checksums b/sysa/autoconf-2.13/checksums
new file mode 100644
index 0000000..e69de29
diff --git a/sysa/run.sh b/sysa/run.sh
index cf7b430..b3c1a9c 100755
--- a/sysa/run.sh
+++ b/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."