diff --git a/install/scripts/install_ocaml.sh b/install/scripts/install_ocaml.sh
index be234dc8..f32a13dd 100755
--- a/install/scripts/install_ocaml.sh
+++ b/install/scripts/install_ocaml.sh
@@ -5,8 +5,7 @@ QP_ROOT=$PWD
 cd -
 
 # Normal installation
-PACKAGES="core cryptokit.1.10 ocamlfind sexplib ZMQ"
-#ppx_sexp_conv
+PACKAGES="core cryptokit.1.10 ocamlfind sexplib ZMQ ppx_sexp_conv ppx_derived"
 
 # Needed for ZeroMQ
 export C_INCLUDE_PATH="${QP_ROOT}"/include:"${C_INCLUDE_PATH}"
@@ -64,17 +63,19 @@ fi
 cd Downloads || exit 1
 chmod +x  ocaml.sh || exit 1
 
-echo N | ./ocaml.sh ${QP_ROOT}/bin/ || exit 1
+echo N | ./ocaml.sh ${QP_ROOT}/bin/ 4.04.2 || exit 1
 
 ${QP_ROOT}/bin/opam config setup -a -q || exit 1
 
 export LD_LIBRARY_PATH=${QP_ROOT}/lib:${LD_LIBRARY_PATH}
 export LIBRARY_PATH=${QP_ROOT}/lib:${LIBRARY_PATH}
-export C_INCLUDE_PATH=${QP_ROOT}/lib:$(ocamlopt -where)/../../include/ocaml_stdint:${C_INCLUDE_PATH}
+export C_INCLUDE_PATH=${QP_ROOT}/lib:${QP_ROOT}/include:${C_INCLUDE_PATH}
 source ${HOME}/.opam/opam-init/init.sh > /dev/null 2> /dev/null || true
 
 
 NCPUs=$(cat /proc/cpuinfo  | grep -i  MHz | wc -l)
+${QP_ROOT}/bin/opam install -j ${NCPUs} stdint.0.4.2 -y -q || exit 1
+${QP_ROOT}/bin/opam install -j ${NCPUs} ZMQ -y -q || exit 1
 ${QP_ROOT}/bin/opam install -j ${NCPUs} ${PACKAGES} -y -q || exit 1
 
 rm -f ../_build/ocaml.log