diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fb60ca72a7c624abce3e2f26edede713ff050ac8..2f98937466ff3358fb0d30d78026b08537d09d70 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,3 +13,13 @@ compilation:
- source /cvmfs/cms.cern.ch/cmsset_default.sh
- yum install -y python3 zsh
- make
+
+cmake:
+ stage: build
+ tags:
+ - cvmfs
+ script:
+ - source /cvmfs/cms.cern.ch/cmsset_default.sh
+ - yum install -y cmake3 python3 zsh
+ - ./install.sh
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b9bda2f882df87369d440f3ad0bcb51f240b1aa9
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: GPLv3-or-later
+#
+# SPDX-FileCopyrightText: Louis Moureaux <louis.moureaux@cern.ch>
+
+cmake_minimum_required(VERSION 3.17...3.28 FATAL_ERROR)
+
+# Set a useful default install directory but let the user override it
+set(CMAKE_INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/tools" CACHE PATH
+ "Install path prefix, prepended onto install directories.")
+
+# Also set a default build type - optimized build with debug information
+set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
+ "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel ...")
+
+project(Installer VERSION 1.0 LANGUAGES C) # Need a language for GNUInstallDirs
+
+include(ExternalProject)
+include(GNUInstallDirs)
+
+install(FILES libgit2.xml TYPE SYSCONF)
+
+set(TUNFOLD_HEADERS TUnfold.h
+ TUnfoldBinning.h
+ TUnfoldBinningXML.h
+ TUnfoldDensity.h
+ TUnfoldIterativeEM.h
+ TUnfoldSys.h
+)
+ExternalProject_Add(TUnfold
+ URL https://www.desy.de/~sschmitt/TUnfold/TUnfold_V17.9.tgz
+ URL_HASH SHA256=d7f66f6a0e007eb946180643b8879bb2b8918441106bc0305b82a97391a391dc
+ SOURCE_DIR "${CMAKE_SOURCE_DIR}/TUnfold"
+ CONFIGURE_COMMAND ""
+ BUILD_COMMAND make lib TUNFOLDVERSION='V17'
+ BUILD_IN_SOURCE TRUE
+ INSTALL_COMMAND install -DT libunfold.so <INSTALL_DIR>/${CMAKE_INSTALL_LIBDIR}/libtunfold.so
+ COMMAND install TUnfoldV17Dict_rdict.pcm <INSTALL_DIR>/${CMAKE_INSTALL_LIBDIR}/
+ COMMAND install -d <INSTALL_DIR>/${CMAKE_INSTALL_INCLUDEDIR}/TUnfold
+ COMMAND install ${TUNFOLD_HEADERS} <INSTALL_DIR>/${CMAKE_INSTALL_INCLUDEDIR}/TUnfold/
+ INSTALL_DIR "${CMAKE_INSTALL_PREFIX}"
+)
+configure_file(tunfold.xml.in tunfold.xml)
+install(FILES "${CMAKE_BINARY_DIR}/tunfold.xml" TYPE SYSCONF)
+
+ExternalProject_Add(ProtoDarwin
+ GIT_REPOSITORY https://gitlab.cern.ch/paconnor/ProtoDarwin.git
+ GIT_TAG origin/master
+ SOURCE_DIR "${CMAKE_SOURCE_DIR}/ProtoDarwin"
+ CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR> -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+ INSTALL_DIR "${CMAKE_INSTALL_PREFIX}"
+ TEST_AFTER_INSTALL ON
+)
+configure_file(protodarwin.xml.in protodarwin.xml)
+install(FILES "${CMAKE_BINARY_DIR}/protodarwin.xml" TYPE SYSCONF)
+
+ExternalProject_Add(tables
+ GIT_REPOSITORY https://gitlab.cern.ch/DasAnalysisSystem/tables.git
+ GIT_TAG origin/master
+ SOURCE_DIR "${CMAKE_SOURCE_DIR}/tables"
+ CONFIGURE_COMMAND ""
+ BUILD_COMMAND ""
+ INSTALL_COMMAND ""
+)
diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000000000000000000000000000000000000..758274b33642983b7a9101f30a013c0cd0ba316c
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+set -e
+
+BASE_DIR=$PWD
+
+# Get a CMSSW if we don't have one
+if [ -z $CMSSW_BASE ]; then
+ version=CMSSW_12_4_0
+ [ ! -d $version ] && cmsrel $version
+ cd $version
+ cmsenv
+ unset version
+fi
+
+# Set up libgit2
+cd $CMSSW_BASE
+scram setup $BASE_DIR/libgit2.xml
+
+# Download and build supporting tools
+cd $BASE_DIR
+cmake3 -B .build
+cmake3 --build .build --target install -j$(nproc)
+
+# Get Core
+cd $CMSSW_BASE/src
+[ ! -d Core ] && git clone https://gitlab.cern.ch/DasAnalysisSystem/Core.git
+
+# Set up scram tools in CMSSW -- must be done after fetching Core
+cd $CMSSW_BASE
+for xml in $BASE_DIR/tools/etc/*.xml; do
+ scram setup $xml
+done
diff --git a/protodarwin.xml.in b/protodarwin.xml.in
new file mode 100644
index 0000000000000000000000000000000000000000..49896af108c40ac585dd543f0735c0e91d5b7da0
--- /dev/null
+++ b/protodarwin.xml.in
@@ -0,0 +1,21 @@
+<tool name="protodarwin" version="1.0"> <!-- TODO -->
+ <lib name="DarwinUserInfo"/>
+ <lib name="DarwinMetaInfo"/>
+ <lib name="DarwinOptions"/>
+ <lib name="DarwinObjects"/>
+ <info url="https://protodarwin.docs.cern.ch"/>
+ <client>
+ <environment name="DARWIN" default="${CMAKE_SOURCE_DIR}"/>
+ <environment name="INCLUDE" default="${CMAKE_INSTALL_FULL_INCLUDEDIR}/ProtoDarwin"/>
+ <environment name="LIBDIR" default="${CMAKE_INSTALL_FULL_LIBDIR}"/>
+ </client>
+ <use name="boost" />
+ <use name="boost_program_options" />
+ <runtime name="DARWIN_BASE" value="${CMAKE_SOURCE_DIR}" type="path"/>
+ <runtime name="DARWIN_FIRE_AND_FORGET" value="$CMSSW_BASE/lib/$SCRAM_ARCH" type="path"/><!-- TODO -->
+ <runtime name="PATH" value="${CMAKE_INSTALL_FULL_BINDIR}" type="path"/>
+ <runtime name="LD_LIBRARY_PATH" value="${CMAKE_INSTALL_FULL_LIBDIR}" type="path"/>
+ <runtime name="PYTHON3PATH" value="${CMAKE_INSTALL_PREFIX}/python" type="path"/>
+ <runtime name="DARWIN_GIT_REPO" value="$CMSSW_BASE/src/Core" type="path"/><!-- TODO -->
+ <runtime name="DARWIN_TABLES" value="${CMAKE_SOURCE_DIR}/tables" type="path"/>
+</tool>
diff --git a/tunfold.xml.in b/tunfold.xml.in
new file mode 100644
index 0000000000000000000000000000000000000000..f19a1e205cc62b5a6fd23bf95ea65b468e5257fa
--- /dev/null
+++ b/tunfold.xml.in
@@ -0,0 +1,13 @@
+<tool name="tunfold" version="17.9">
+ <lib name="tunfold"/>
+ <info url="https://www.desy.de/~sschmitt/tunfold.html"/>
+ <client>
+ <environment name="TUNFOLD_BASE" default="${CMAKE_SOURCE_DIR}/TUnfold"/><!-- FIXME Needed? -->
+ <environment name="INCLUDE" default="${CMAKE_INSTALL_FULL_INCLUDEDIR}/TUnfold"/>
+ <environment name="LIBDIR" default="${CMAKE_INSTALL_FULL_LIBDIR}"/>
+ </client>
+ <use name="root_cxxdefaults"/>
+ <lib name="XMLIO" />
+ <lib name="XMLParser" />
+ <runtime name="LD_LIBRARY_PATH" value="$LIBDIR" type="path"/>
+</tool>