diff -u libdrm-2.4.100/debian/changelog libdrm-2.4.100/debian/changelog
--- libdrm-2.4.100/debian/changelog
+++ libdrm-2.4.100/debian/changelog
@@ -1,3 +1,10 @@
+libdrm (2.4.100-4+rpi1) bullseye-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>  Thu, 28 Nov 2019 13:48:56 +0000
+
 libdrm (2.4.100-4) unstable; urgency=medium
 
   * rules: Override dh_missing.
diff -u libdrm-2.4.100/debian/control libdrm-2.4.100/debian/control
--- libdrm-2.4.100/debian/control
+++ libdrm-2.4.100/debian/control
@@ -13,7 +13,8 @@
  xutils-dev (>= 1:7.6+2),
  libudev-dev [linux-any],
  libpciaccess-dev,
- valgrind [amd64 armhf i386 mips mipsel powerpc s390x],
+Build-conflicts:
+ Valgrind
 Standards-Version: 4.1.4
 Section: libs
 Vcs-Git: https://salsa.debian.org/xorg-team/lib/libdrm