diff --git a/CLUEstering.spec b/CLUEstering.spec
new file mode 100644
index 00000000000..e6334d50168
--- /dev/null
+++ b/CLUEstering.spec
@@ -0,0 +1,14 @@
+### RPM external CLUEstering 2.6.3
+## NOCOMPILER
+
+Source: https://gitlab.cern.ch/kalos/%{n}/-/archive/%{realversion}/%{n}-%{realversion}.tar.gz
+Requires: alpaka
+Requires: boost
+
+%prep
+%setup -n %{n}-%{realversion}
+
+%build
+
+%install
+cp -ar include %{i}/include
diff --git a/cluestering.spec b/cluestering.spec
new file mode 100644
index 00000000000..c078c3e4ed9
--- /dev/null
+++ b/cluestering.spec
@@ -0,0 +1,16 @@
+### RPM external CLUEstering 2.6.2
+## NOCOMPILER
+
+Source: https://gitlab.cern.ch/kalos/%{n}/archive/${realversion}/%{n}-${realversion}.tar.gz
+Requires: Alpaka
+Requires: boost
+
+%prep
+%setup -n %{n}-%{git_commit}
+
+%build
+
+%install
+cp -ar include %{i}/include
+
+%post
diff --git a/cmssw-tools.spec b/cmssw-tools.spec
index c7315086051..a2b91f1d187 100644
--- a/cmssw-tools.spec
+++ b/cmssw-tools.spec
@@ -155,6 +155,7 @@ Requires: gperftools
 
 Requires: alpaka
 Requires: clue
+Requires: CLUEstering
 Requires: libunwind
 %ifnarch ppc64le
 %ifnarch riscv64
diff --git a/scram-tools.file/tools/CLUEstering/CLUEstering.xml b/scram-tools.file/tools/CLUEstering/CLUEstering.xml
new file mode 100644
index 00000000000..002da4bb703
--- /dev/null
+++ b/scram-tools.file/tools/CLUEstering/CLUEstering.xml
@@ -0,0 +1,7 @@
+<tool name="CLUEstering" version="@TOOL_VERSION@" revision="1">
+  <use name="alpaka"/>
+  <client>
+    <environment name="CLUESTERING_BASE" default="@TOOL_ROOT@"/>
+    <environment name="INCLUDE"   default="$CLUESTERING_BASE/include"/>
+  </client>
+</tool>