I am uploading a NMU to DELAYED/10 in order to fix this.
Please find the debdiff attached.
diff -Nru vanessa-socket-0.0.13/debian/changelog
vanessa-socket-0.0.13/debian/changelog
--- vanessa-socket-0.0.13/debian/changelog 2015-06-14 06:53:27.000000000
+0200
+++ vanessa-socket-0.0.13/debian/changelog 2023-11-08 22:53:54.000000000
+0100
@@ -1,3 +1,14 @@
+vanessa-socket (0.0.13-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Convert to source format 3.0 (Closes: #953993, #1007465)
+
+ [ Helmut Grohne ]
+ * Fix FTCBFS: Don't configure via autogen.sh,
+ let dh_auto_configure do it (Closes: #990438)
+
+ -- Bastian Germann <b...@debian.org> Wed, 08 Nov 2023 22:53:54 +0100
+
vanessa-socket (0.0.13-1) unstable; urgency=medium
* New Upstream
diff -Nru vanessa-socket-0.0.13/debian/patches/auotogen.patch
vanessa-socket-0.0.13/debian/patches/auotogen.patch
--- vanessa-socket-0.0.13/debian/patches/auotogen.patch 1970-01-01
01:00:00.000000000 +0100
+++ vanessa-socket-0.0.13/debian/patches/auotogen.patch 2023-11-08
22:53:54.000000000 +0100
@@ -0,0 +1,15 @@
+Description: autogen: Test for NO_CONFIGURE variable
+Author: Helmut Grohne <hel...@subdivi.de>
+Bug-Debian: https://bugs.debian.org/990438
+---
+--- vanessa-socket-0.0.13.orig/autogen.sh
++++ vanessa-socket-0.0.13/autogen.sh
+@@ -55,6 +55,8 @@ libtoolize --ltdl
+ automake --add-missing $am_opt
+ cd $THEDIR
+
++test -n "$NO_CONFIGURE" && exit 0
++
+ $srcdir/configure "$@" || exit $?
+
+ echo
diff -Nru vanessa-socket-0.0.13/debian/patches/series
vanessa-socket-0.0.13/debian/patches/series
--- vanessa-socket-0.0.13/debian/patches/series 1970-01-01 01:00:00.000000000
+0100
+++ vanessa-socket-0.0.13/debian/patches/series 2023-11-08 22:53:54.000000000
+0100
@@ -0,0 +1 @@
+auotogen.patch
diff -Nru vanessa-socket-0.0.13/debian/rules vanessa-socket-0.0.13/debian/rules
--- vanessa-socket-0.0.13/debian/rules 2014-09-11 03:37:45.000000000 +0200
+++ vanessa-socket-0.0.13/debian/rules 2023-11-08 22:53:54.000000000 +0100
@@ -3,7 +3,6 @@
# GNU copyright 1997 to 1999 by Joey Hess.
pwd:=$(shell pwd)
-cfg:=--prefix=/usr --mandir=/usr/share/man
DPKG_EXPORT_BUILDFLAGS = 1
include /usr/share/dpkg/buildflags.mk
@@ -15,7 +14,8 @@
dh_testdir
dh_autoreconf
- test -x autogen.sh && ./autogen.sh $(cfg) || ./configure $(cfg)
+ test -x autogen.sh && NO_CONFIGURE=1 ./autogen.sh
+ dh_auto_configure
$(MAKE) V=1
touch build-stamp
diff -Nru vanessa-socket-0.0.13/debian/source/format
vanessa-socket-0.0.13/debian/source/format
--- vanessa-socket-0.0.13/debian/source/format 1970-01-01 01:00:00.000000000
+0100
+++ vanessa-socket-0.0.13/debian/source/format 2023-11-08 22:53:54.000000000
+0100
@@ -0,0 +1 @@
+3.0 (quilt)
