diff --git a/Compiler/fluka4/.gitkeep b/Compiler/fluka4/.gitkeep
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index 0000000..e69de29
diff --git a/Compiler/fluka4/README.md b/Compiler/fluka4/README.md
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+++ b/Compiler/fluka4/README.md
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+# FLUKA and Flair module
+
+PSI has a institutional license for FLUKA and Flair. Anyway users should register.
+
+## Download
+
+https://fluka.cern
+
+
+## Install
+```
+FLUKA4_VERSION=2.2
+FLAIR_VERSION=3.1-15.1
+
+GCC_VERSION=9.3.0
+PYTHON_VERSION=3.8.8
+TCLTK_VERSION=8.6.9
+
+PREFIX="${PMODULES_ROOT}/Compiler/fluka4/${FLUKA4_VERSION}/gcc/${GCC_VERSION}"
+DISTFILES_DIR='/afs/psi.ch/software/Pmodules/distfiles'
+FLUKA_TAR="${DISTFILES_DIR}/fluka-4-${FLUKA4_VERSION}.x86-Linux-gfor${GCC_VERSION/.*}.tar.bz2"
+FLAIR_TAR="${DISTFILES_DIR}/flair-${FLAIR_VERSION}.tar.bz2"
+GEOVIEWER_TAR="${DISTFILES_DIR}/flair-geoviewer-${FLAIR_VERSION}.tar.bz2"
+
+module load gcc/${GCC_VERSION} Python/${PYTHON_VERSION} TclTk/${TCLTK_VERSION}
+
+mkdir -p "${PREFIX}" && cd "$_"
+
+tar --strip-components=1 -xvf "${FLUKA_TAR}"
+cd src
+make
+
+mkdir -p "${PREFIX}/flair" && cd "$_"
+make
+
+cd "${PREFIX}"
+ln -s lib lib64
+cp -av "${TCLTK_DIR}/lib/libtcl8.6.so" lib
+cp -av "${TCLTK_DIR}/lib/libtk8.6.so"  lib64
+
+echo "gcc/${GCC_VERSION}"       > .dependencies
+echo "Python/${PYTHON_VERSION}" >> .dependencies
+```
diff --git a/Compiler/fluka4/files/variants.rhel7 b/Compiler/fluka4/files/variants.rhel7
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+++ b/Compiler/fluka4/files/variants.rhel7
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+fluka4/2.2	unstable	gcc/9.3.0 Python/3.8.8
diff --git a/Compiler/fluka4/modulefiles b/Compiler/fluka4/modulefiles
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+++ b/Compiler/fluka4/modulefiles
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+#%Module1.0
+
+module-whatis		"FLUKA & Flair"
+module-url		"https://fluka.cern"
+module-license		"https://fluka.cern/download/licences"
+module-maintainer	"Achim Gsell <achim.gsell@psi.ch>"
+module-help	"
+The FLUKA code is a general purpose Monte Carlo code for the interaction
+and transport of hadrons, leptons, and photons from keV (with the exception
+of neutrons, tracked down to thermal energies) to cosmic ray energies in
+any material.
+"
+
+prepend-path PATH "$PREFIX/flair"