diff --git a/cmssw-tool-conf.spec b/cmssw-tool-conf.spec
index f68ed75beeb..8265daa2280 100644
--- a/cmssw-tool-conf.spec
+++ b/cmssw-tool-conf.spec
@@ -39,6 +39,7 @@ Requires: hepmc-toolfile
 Requires: heppdt-toolfile
 Requires: herwig-toolfile
 Requires: herwigpp-toolfile
+Requires: hydjet-toolfile
 Requires: ittnotify-toolfile
 Requires: jemalloc-toolfile
 Requires: jemalloc-debug-toolfile
diff --git a/hydjet-toolfile.spec b/hydjet-toolfile.spec
new file mode 100644
index 00000000000..02bb671c727
--- /dev/null
+++ b/hydjet-toolfile.spec
@@ -0,0 +1,23 @@
+### RPM external hydjet-toolfile 1.0
+Requires: hydjet
+%prep
+
+%build
+
+%install
+
+mkdir -p %i/etc/scram.d
+cat << \EOF_TOOLFILE >%i/etc/scram.d/hydjet.xml
+<tool name="hydjet" version="@TOOL_VERSION@">
+  <lib name="hydjet"/>
+  <client>
+    <environment name="HYDJET_BASE" default="@TOOL_ROOT@"/>
+    <environment name="LIBDIR" default="$HYDJET_BASE/lib"/>
+  </client>
+  <use name="pyquen"/>
+  <use name="pythia6"/>
+  <use name="lhapdf"/>
+</tool>
+EOF_TOOLFILE
+
+## IMPORT scram-tools-post
diff --git a/hydjet.spec b/hydjet.spec
new file mode 100644
index 00000000000..dd6516395cb
--- /dev/null
+++ b/hydjet.spec
@@ -0,0 +1,20 @@
+### RPM external hydjet 1.9.1
+
+Source: http://cern.ch/lokhtin/hydro/%{n}-%{realversion}.tar.gz
+
+BuildRequires: cmake gmake
+
+Requires: pyquen pythia6 lhapdf
+
+
+%prep
+%setup -q -n %{n}-%{realversion}
+
+%build
+
+cmake . -DCMAKE_INSTALL_PREFIX=%i -DCMAKE_BUILD_TYPE=Release -DPYQUEN_DIR=${PYQUEN_ROOT} -DPYTHIA6_DIR=${PYTHIA6_ROOT} -DLHAPDF_ROOT_DIR=${LHAPDF_ROOT}
+cmake --build . --clean-first -- %{makeprocesses}
+
+%install
+
+cmake --build . --target install -- %{makeprocesses}
diff --git a/hydjet/doc.txt b/hydjet/doc.txt
new file mode 100644
index 00000000000..fcf4a8ff517
--- /dev/null
+++ b/hydjet/doc.txt
@@ -0,0 +1,13 @@
+- Requested, AddedBy: 
+  @wouf
+  
+- PR:
+  https://github.com/cms-sw/cmsdist/pull/5412
+
+- Description:
+  {hydjet} is event generator to simulate jet production, jet quenching and flow effects in ultrarelativistic heavy ion AA collisions   
+  http://lokhtin.web.cern.ch/lokhtin/hydro/hydjet.html
+
+- Documentation
+  http://lokhtin.web.cern.ch/lokhtin/hydro/hydjet.txt
+  
diff --git a/pyquen.spec b/pyquen.spec
index b3a2e009d6e..a15c5db0983 100644
--- a/pyquen.spec
+++ b/pyquen.spec
@@ -1,8 +1,8 @@
-### RPM external pyquen 1.5.3
+### RPM external pyquen 1.5.4
 
 Source: http://lokhtin.web.cern.ch/lokhtin/%{n}/%{n}-%{realversion}.tar.gz
 
-BuildRequires: cmake
+BuildRequires: cmake gmake
 
 Requires: pythia6 lhapdf
 
@@ -17,4 +17,4 @@ cmake --build . --clean-first -- %{makeprocesses}
 
 %install
 
-cmake --build . --target install --clean-first -- %{makeprocesses}
+cmake --build . --target install -- %{makeprocesses}
diff --git a/pyquen/doc.txt b/pyquen/doc.txt
new file mode 100644
index 00000000000..4561cf885a4
--- /dev/null
+++ b/pyquen/doc.txt
@@ -0,0 +1,13 @@
+- Requested, AddedBy: 
+  @wouf
+
+- PR:
+  https://github.com/cms-sw/cmsdist/pull/4790
+
+- Description:
+  {pyquen} is event generator for simulation of rescattering, radiative and collisional energy loss of hard partons in expanding quark-gluon plasma created in ultrarelativistic heavy ion AA collisions
+  http://lokhtin.web.cern.ch/lokhtin/pyquen/
+
+- Documentation
+  http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
+