I am uploading a NMU to fix this.
The debdiff is attached.
diff -Nru mtr-0.95/debian/changelog mtr-0.95/debian/changelog
--- mtr-0.95/debian/changelog 2022-01-11 13:46:46.000000000 +0100
+++ mtr-0.95/debian/changelog 2023-09-29 10:39:36.000000000 +0200
@@ -1,3 +1,10 @@
+mtr (0.95-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Build with GTK 3 (Closes: #967647)
+
+ -- Bastian Germann <b...@debian.org> Fri, 29 Sep 2023 10:39:36 +0200
+
mtr (0.95-1) unstable; urgency=medium
* New upstream version 0.95
diff -Nru mtr-0.95/debian/control mtr-0.95/debian/control
--- mtr-0.95/debian/control 2022-01-11 13:46:46.000000000 +0100
+++ mtr-0.95/debian/control 2023-09-29 10:39:09.000000000 +0200
@@ -8,7 +8,7 @@
Homepage: https://www.bitwizard.nl/mtr/
Build-Depends: automake,
debhelper-compat (= 13),
- libgtk2.0-dev,
+ libgtk-3-dev,
libncurses-dev,
libjansson-dev
Vcs-Browser: https://salsa.debian.org/debian/mtr
