diff --git a/srcpkgs/mesa/patches/clover-ppc64-cpp14.patch b/srcpkgs/mesa/patches/clover-ppc64-cpp14.patch
new file mode 100644
index 00000000000..b7eef76959a
--- /dev/null
+++ b/srcpkgs/mesa/patches/clover-ppc64-cpp14.patch
@@ -0,0 +1,13 @@
+LLVM10 headers need C++14, so override the override.
+
+--- meson.build
++++ meson.build
+@@ -730,7 +730,7 @@ if _opencl != 'disabled'
+       #error "AltiVec not enabled"
+       #endif''',
+       name : 'Altivec')
+-    clover_cpp_std += ['cpp_std=gnu++11']
++    clover_cpp_std += ['cpp_std=gnu++14']
+   endif
+ else
+   dep_clc = null_dep
diff --git a/srcpkgs/mesa/template b/srcpkgs/mesa/template
index 0d49f2badf4..3f98f454709 100644
--- a/srcpkgs/mesa/template
+++ b/srcpkgs/mesa/template
@@ -1,13 +1,13 @@
 # Template file for 'mesa'
 pkgname=mesa
 version=20.0.6
-revision=1
+revision=2
 wrksrc="mesa-${version}"
 build_style=meson
 configure_args="-Dglvnd=true -Dshared-glapi=true -Dgbm=true -Degl=true
  -Dosmesa=gallium -Dgles1=true -Dgles2=true -Dglx=dri -Ddri3=true
  -Dlmsensors=true -Dplatforms=x11,drm,$(vopt_if wayland wayland),surfaceless
- -Dllvm=true -Db_lto=false"
+ -Dllvm=true -Db_lto=false -Dcpp_std=gnu++14"
 hostmakedepends="gettext flex libxml2-python llvm pkg-config
  python3-Mako $(vopt_if wayland 'wayland-protocols wayland-devel')
  glslang"