diff -Nru libdrm-2.4.108/debian/changelog libdrm-2.4.108/debian/changelog
--- libdrm-2.4.108/debian/changelog	2021-11-17 09:33:25.000000000 +0000
+++ libdrm-2.4.108/debian/changelog	2021-11-24 03:16:54.000000000 +0000
@@ -1,3 +1,10 @@
+libdrm (2.4.108-1+rpi1) bookworm-staging; urgency=medium
+
+  [changes brought forward from 2.4.74-1+rpi1 by Peter Michael Green <plugwash@raspbian.org> at Wed, 28 Jun 2017 21:14:42 +0000]
+  * Move valgrind to build-conflicts, the old version in raspbian breaks the build.
+
+ -- Raspbian forward porter <root@raspbian.org>  Wed, 24 Nov 2021 03:16:54 +0000
+
 libdrm (2.4.108-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru libdrm-2.4.108/debian/control libdrm-2.4.108/debian/control
--- libdrm-2.4.108/debian/control	2021-11-17 09:27:30.000000000 +0000
+++ libdrm-2.4.108/debian/control	2021-11-24 03:16:54.000000000 +0000
@@ -15,6 +15,8 @@
  libpciaccess-dev,
  python3-docutils,
 # valgrind [amd64 armhf i386 mips mipsel powerpc s390x],
+Build-conflicts:
+ Valgrind
 Standards-Version: 4.5.0
 Section: libs
 Vcs-Git: https://salsa.debian.org/xorg-team/lib/libdrm