diff --git a/autoconf-2.13/.signature b/autoconf-2.13/.signature
index ef89cccb5..fea58fa96 100644
--- a/autoconf-2.13/.signature
+++ b/autoconf-2.13/.signature
@@ -1,5 +1,5 @@
-untrusted comment: verify with /etc/ports/contrib.pub
-RWSagIOpLGJF3zJsjuF83/3e8H0nrW3bQpUJ/1WBN8NpyYgKPk/tNAEw3aCt+EIKuxJyYhR0qAgb9eiKeyYjUK+0MbIy4yPN5QY=
-SHA256 (Pkgfile) = 1747b94b1e4d858dca8fe928413239a84a34b7cb73713ab889c6884b0ef4e47b
+untrusted comment: verify with /etc/ports/opt.pub
+RWSE3ohX2g5d/WKZOXb7vxzUwWcwBBKDVKG/0xhDa6p4VNJip7oKY1TUh+XBXa/0WvPStkbMtq9xq4FFXShylyix5oNexQpA7wA=
+SHA256 (Pkgfile) = 853893f4e177fd1e9a54f16d5c263f08be46396bd29d76baf721ef954c4b8271
 SHA256 (.footprint) = 2582ece0d8ff83bf96bdca8eb0e4d81785fc6f6548a05915beb3849f49255887
 SHA256 (autoconf-2.13.tar.gz) = f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e
diff --git a/autoconf-2.13/Pkgfile b/autoconf-2.13/Pkgfile
index 4fd5afb81..29f69e6eb 100644
--- a/autoconf-2.13/Pkgfile
+++ b/autoconf-2.13/Pkgfile
@@ -1,18 +1,19 @@
 # Description: A package of M4 macros to produce scripts to automatically configure sourcecode. (2.13 version)
-# URL: http://www.gnu.org/software/autoconf
-# Maintainer: Danny Rawlins, crux at romster dot me
+# URL: https://www.gnu.org/software/autoconf
+# Maintainer: Tim Biermann, tbier at posteo dot de
 
 name=autoconf-2.13
 version=2.13
 release=1
-source=(ftp://ftp.gnu.org/gnu/autoconf/autoconf-$version.tar.gz)
+source=(https://mirror.fcix.net/gnu/autoconf/autoconf-$version.tar.gz)
 
 build () {
-	cd autoconf-$version
+  cd autoconf-$version
 
-	./configure --prefix=/usr --program-suffix=-2.13
-	make
-	make prefix=$PKG/usr install
+  ./configure --prefix=/usr \
+    --program-suffix=-2.13
+  make
+  make prefix=$PKG/usr install
 
-	rm -r $PKG/usr/info
+  rm -r $PKG/usr/info
 }