diff --git a/.gitignore b/.gitignore
index 7dcbabc83..dd49e2a49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,5 +18,6 @@ libraries/zenon_modulo
 *.install
 *.gv
 *.png
+*.dot
 .DS_Store
 *.map
diff --git a/tools/depgraph/README.md b/tools/depgraph/README.md
new file mode 100644
index 000000000..b8dfddcf8
--- /dev/null
+++ b/tools/depgraph/README.md
@@ -0,0 +1,22 @@
+This is a temporary shell script generating the ocaml dependency graph.
+
+-- How it works ?
+
+1. it gets the dependencies with ``ocamldep ... | grep ...``
+2. it generates the \*.mli from the \*.ml and gets the constants and functions with ``ocamlc.opt -i ... | grep -e "^val"`` 
+3. it gets the constants and functions in the dependency by greping the sources
+4. it generates the dot files with one colour by module dependency
+
+-- How to use it ?
+
+1. choose a set of interesting modules : change the interesting_modules variable
+2. remove the interesting ``open Module`` in sources so that functions are explicitly called by ``Module.function a b c``. If you don't do it, you will get the graph with the modules (the nodes) and their dependencies (the edges) but you will miss the called functions (label on the edges)
+3. the script has to be used after building lambdapi with dune (as it uses the the src/core/.core.objs/byte/\*.cmi files)
+4. just call the script : ``./depgraph.sh``
+
+-- Why it sucks ?
+
+1. it's really a build-system (dune) job to generate such things
+2. it should be written in ocaml (and using the graphviz library)
+3. it doesn't work correctly with submodules
+4. it's grep-ing the source instead of using the compiler libs to get the list of defined symbols
diff --git a/tools/depgraph/depgraph.sh b/tools/depgraph/depgraph.sh
new file mode 100755
index 000000000..49f0f0ed1
--- /dev/null
+++ b/tools/depgraph/depgraph.sh
@@ -0,0 +1,86 @@
+#!/bin/bash
+# shellcheck disable=SC2086
+
+set -eu -o pipefail
+
+# UPPERCASE THE FIRST LETTER OF A WORD
+function uppercasefirst ()
+{
+  word=$1
+  first=${word:0:1}
+  firstupper=${first^^}
+  wordwithoutfirst=${word:1}
+  echo "${firstupper}${wordwithoutfirst}"
+}
+
+errordirectory="error : non-existing directory"
+workingdir=$(pwd)
+scriptdir=$(dirname "${BASH_SOURCE[0]}")
+lambdapidir=$(cd ${scriptdir}/../.. || { echo $errordirectory ; exit 1; } ; pwd)
+graph=graph
+graphdot=$workingdir/$graph.dot
+graphpng=$workingdir/$graph.png
+
+# CHOOSE THE INTERESTING_MODULES MODULES
+concat_modules="$@"
+if [ -z "$concat_modules" ] ; then
+  interesting_modules=( compile handle infer proof sr tactics typing unif )
+else
+  interesting_modules=( $@ )
+fi
+
+# cd $lambdapidir/src/core
+# interesting_modules=( )
+# for mlfile in $(ls *.ml) ; do
+#   if [ $mlfile != parser.ml ] ; then #remove module with ppx/preprocessor extension
+#     mlfilenoml=$(basename ${mlfile} .ml)
+#     interesting_modules+=( "$mlfilenoml" )
+#   fi
+# done
+
+# COLORSCHEME
+backgroundcolor="#252525"
+paired12=( "#a6cee3" "#1f78b4" "#b2df8a" "#33a02c" "#fb9a99" "#e31a1c" "#fdbf6f" "#ff7f00" "#cab2d6" "#6a3d9a" "#ffff99" "#b15928" )
+# brbg11 minus the darkest one
+brbg11=( "#8c510a" "#bf812d" "#dfc27d" "#f6e8c3" "#f5f5f5" "#c7eae5" "#80cdc1" "#35978f" "#01665e" "#003c30" ) 
+# piyg11 minus the darkest one
+piyg11=( "#762a83" "#9970ab" "#c2a5cf" "#e7d4e8" "#f7f7f7" "#d9f0d3" "#a6dba0" "#5aae61" "#1b7837" "#00441b" ) 
+colorscheme=( "${paired12[@]}" "${piyg11[@]}" "${brbg11[@]}" "${paired12[@]}" "${piyg11[@]}" "${brbg11[@]}" "${paired12[@]}" "${piyg11[@]}" "${brbg11[@]}" )
+
+# GENERATE THE GRAPH TEXT FILE
+rm -f $graphdot 
+echo "digraph g {" > $graphdot
+echo "graph [bgcolor=\"$backgroundcolor\"];" >> $graphdot
+
+icolor=0
+for mldependency in "${interesting_modules[@]}" ; do
+  mldependencycolor=${colorscheme[$icolor]}
+  mldependencywithupper=$(uppercasefirst $mldependency)
+  echo "$mldependencywithupper [style=filled,fillcolor=\"$mldependencycolor\"];" >> $graphdot
+  for mlfile in "${interesting_modules[@]}" ; do
+    mlfilewithupper=$(uppercasefirst $mlfile)
+    if [ $mlfile != $mldependency ] ; then
+      cd $lambdapidir || { echo $errordirectory ; exit 1; }
+      mlfiledependsonmldependency=$(ocamldep -modules src/core/${mlfile}.ml | grep $mldependencywithupper) || true
+      if [ -n "$mlfiledependsonmldependency" ] ; then
+        cd $lambdapidir/_build/default || { echo $errordirectory ; exit 1; }
+        mldependencyfunctions=$(ocamlc -i -I src/core/.core.objs/byte -open Core src/core/${mldependency}.ml 2>&1 | grep -e "^val" | grep -v "type t =" | awk '{print $2}' ) || true
+        cd $lambdapidir || { echo $errordirectory ; exit 1; }
+        mldependencyfunctioninmlfile=( )
+        for function in ${mldependencyfunctions[*]} ; do
+          present=$(grep $mldependencywithupper.$function src/core/$mlfile.ml) || true
+          if [ -n "$present" ] ; then
+            mldependencyfunctioninmlfile+=( "$function\n" )
+          fi
+        done
+        echo "    $mlfilewithupper -> $mldependencywithupper [color=\"$mldependencycolor\",fillcolor=\"$mldependencycolor\",fontcolor=\"$mldependencycolor\",label="\"${mldependencyfunctioninmlfile[*]}\""];" >> $graphdot
+      fi
+    fi
+  done
+  icolor=$((icolor+1))
+done
+echo "}" >> $graphdot
+
+# GENERATE THE GRAPH
+cd $workingdir || { echo $errordirectory ; exit 1; }
+dot $graphdot -Tpng -o $graphpng