diff --git a/configure.sh b/configure.sh
index c050d38..e37b138 100755
--- a/configure.sh
+++ b/configure.sh
@@ -2,16 +2,23 @@
 
 set -e
 set -u
-cd install
+QMCCHEM_PATH=$PWD
+mkdir -p "${QMCCHEM_PATH}"/bin
+cd "${QMCCHEM_PATH}"/install
 mkdir -p Downloads _build
-mkdir -p bin
-if [[ ! -x ../bin/ninja ]]
+# TODO : Check if network is up (ping)
+if [[ ! -x "${QMCCHEM_PATH}"/bin/ninja ]]
 then
   echo "Installing Ninja"
   ./scripts/install_ninja.sh &> _build/ninja.log 
+  if [[ ! -x "${QMCCHEM_PATH}"/bin/ninja ]]
+  then
+    echo "Installation of Ninja failed"
+    exit 1
+  fi
   touch _build/ninja.ok
 fi
-touch ../{src,ocaml}/ls_md5
-exec ../bin/ninja "$@"
+touch "${QMCCHEM_PATH}"/{src,ocaml}/ls_md5
+exec "${QMCCHEM_PATH}"/bin/ninja "$@"
 
 
diff --git a/install/scripts/install_ezfio.sh b/install/scripts/install_ezfio.sh
index 3b3899e..8031ac8 100755
--- a/install/scripts/install_ezfio.sh
+++ b/install/scripts/install_ezfio.sh
@@ -4,11 +4,9 @@ TARGET=ezfio
 
 function _install()
 {
+  cd .. ; QMCCHEM_PATH="$PWD" ; cd -
   set -e
   set -u
-  cd ..
-  QMCCHEM_PATH="$PWD"
-  cd -
   rm -rf "${QMCCHEM_PATH}"/EZFIO
   cd "${BUILD}"/config
   rm -f -- qmc.config properties.config
diff --git a/install/scripts/install_f77_zmq.sh b/install/scripts/install_f77_zmq.sh
index ecde0df..a996788 100755
--- a/install/scripts/install_f77_zmq.sh
+++ b/install/scripts/install_f77_zmq.sh
@@ -3,16 +3,17 @@
 TARGET=f77_zmq
 function _install()
 {
+  cd .. ; QMCCHEM_PATH="$PWD" ; cd -
   set +u
-  export C_INCLUDE_PATH=$C_INCLUDE_PATH:../../../lib
+  export C_INCLUDE_PATH="${C_INCLUDE_PATH}":../../../lib
   set -e
   set -u
   cd "${BUILD}"
-  export ZMQ_H=../../../lib/zmq.h
+  export ZMQ_H="${QMCCHEM_PATH}"/lib/zmq.h
   cp "${ZMQ_H}" .
-  make -j
+  make -j 8
   cd - 
-  rm -f -- "../src/ZMQ/f77_zmq.h" "../lib/libf77zmq.a" "../lib/libf77zmq.so"
+  rm -f -- "${QMCCHEM_PATH}"/src/ZMQ/f77_zmq.h "${QMCCHEM_PATH}"/lib/libf77zmq.a "${QMCCHEM_PATH}"/lib/libf77zmq.so
   cp "${BUILD}"/libf77zmq.{a,so} ../lib/ 
   cp "${BUILD}"/f77_zmq.h ../src/ZMQ/ 
   return 0
diff --git a/install/scripts/install_irpf90.sh b/install/scripts/install_irpf90.sh
index a881336..3c193ea 100755
--- a/install/scripts/install_irpf90.sh
+++ b/install/scripts/install_irpf90.sh
@@ -3,22 +3,23 @@
 TARGET=irpf90
 function _install()
 {
+  cd .. ; QMCCHEM_PATH="$PWD" ; cd -
   set -e
   set -u
-  make -C "${BUILD}" -j
-  rm -rf -- ../irpf90 
-  mv "${BUILD}" ../
+  make -C "${BUILD}" -j 8
+  rm -rf -- "${QMCCHEM_PATH}"/irpf90 
+  mv "${BUILD}" "${QMCCHEM_PATH}"
   # Check the build is OK
-  [[ -x ../irpf90/bin/irpf90 ]]
-  [[ -x ../irpf90/bin/irpman ]]
+  [[ -x "${QMCCHEM_PATH}"/irpf90/bin/irpf90 ]]
+  [[ -x "${QMCCHEM_PATH}"/irpf90/bin/irpman ]]
   for i in irpf90 irpman
   do
-    rm -rf -- ../bin/$i
+    rm -rf -- "${QMCCHEM_PATH}"/bin/$i
     cat << EOF > ../bin/$i
 #!/bin/bash -u
 exec "\${QMCCHEM_PATH}"/irpf90/bin/$i "\$@"
 EOF
-    chmod +x ../bin/$i
+    chmod +x "${QMCCHEM_PATH}"/bin/$i
   done
   return 0
 }
diff --git a/install/scripts/install_ninja.sh b/install/scripts/install_ninja.sh
index 6b71b5c..882437e 100755
--- a/install/scripts/install_ninja.sh
+++ b/install/scripts/install_ninja.sh
@@ -8,12 +8,13 @@ URL="http://github.com/martine/ninja/archive/v1.5.3.tar.gz"
 
 function _install()
 {
+  cd .. ; QMCCHEM_PATH="$PWD" ; cd -
   set -e
   set -u
   cd "${BUILD}"
   ./configure.py --bootstrap
   cd -
-  mv "${BUILD}/ninja" ../bin/
+  mv "${BUILD}/ninja" "${QMCCHEM_PATH}"/bin/
   return 0 
 }
 
diff --git a/install/scripts/install_ocaml.sh b/install/scripts/install_ocaml.sh
index eb1f5aa..8a4ce0d 100755
--- a/install/scripts/install_ocaml.sh
+++ b/install/scripts/install_ocaml.sh
@@ -3,6 +3,7 @@
 set -u
 set -e
 
+cd .. ; QMCCHEM_PATH="$PWD" ; cd -
 PACKAGES="core cryptokit ocamlfind sexplib"
 
 declare -i i
@@ -13,7 +14,7 @@ then
    exit 1
 fi
 
-source ../qmcchemrc
+source "${QMCCHEM_PATH}"/qmcchemrc
 cd Downloads 
 chmod +x opam_installer.sh
 
@@ -41,7 +42,7 @@ export LIBRARY_PATH="${QMCCHEM_PATH}/lib:${LIBRARY_PATH}"
 export C_INCLUDE_PATH="${QMCCHEM_PATH}/lib:${C_INCLUDE_PATH}"
 set -u
 opam install ${PACKAGES} 
-rm ../_build/ocaml.log
+rm "${QMCCHEM_PATH}"/install/_build/ocaml.log
 exit 0
 
 
diff --git a/install/scripts/install_ocaml_zmq.sh b/install/scripts/install_ocaml_zmq.sh
index 925edd0..76e7742 100755
--- a/install/scripts/install_ocaml_zmq.sh
+++ b/install/scripts/install_ocaml_zmq.sh
@@ -1,18 +1,33 @@
 #!/bin/bash -x
 
+cd .. ; QMCCHEM_PATH="$PWD" ; cd -
 set -e
 set -u
 
+
+# Check GCC version 
 declare -i i
-i=$(gcc -dumpversion | cut -d '.' -f 2)
-if [[ i -lt 6 ]]
+i=$(gcc -dumpversion | cut -d '.' -f 1)
+if [[ i -lt 4 ]]
 then
    echo "GCC version $(gcc -dumpversion) too old. GCC >= 4.6 required."
    exit 1
 fi
 
+if [[ i -eq 4 ]]
+then
+  i=$(gcc -dumpversion | cut -d '.' -f 2)
+  if [[ i -lt 6 ]]
+  then
+    echo "GCC version $(gcc -dumpversion) too old. GCC >= 4.6 required."
+    exit 1
+  fi
+fi
+# End check GCC version 
+
+
 set +u
-source ../qmcchemrc
+source "${QMCCHEM_PATH}"/qmcchemrc
 set -u
 opam install zmq 
 rm -f _build/ocaml_zmq.log
diff --git a/install/scripts/install_qmcchemrc.sh b/install/scripts/install_qmcchemrc.sh
index 476abe1..e00cd42 100755
--- a/install/scripts/install_qmcchemrc.sh
+++ b/install/scripts/install_qmcchemrc.sh
@@ -11,7 +11,7 @@ export QMCCHEM_MPIRUN="mpirun"
 export QMCCHEM_MPIRUN_FLAGS="--bind-to-core"
 #export QMCCHEM_NIC=ib0
 source \${QMCCHEM_PATH}/irpf90/bin/irpman
-source \${QMCCHEM_PATH}/EZFIO/Bash/ezfio.sh
+#source \${QMCCHEM_PATH}/EZFIO/Bash/ezfio.sh
 EOF
 
 cd -
diff --git a/install/scripts/install_zmq.sh b/install/scripts/install_zmq.sh
index 58a160c..80da3a3 100755
--- a/install/scripts/install_zmq.sh
+++ b/install/scripts/install_zmq.sh
@@ -4,6 +4,7 @@ TARGET=zmq
 function _install()
 {
   LIBVERSION=4
+  cd .. ; QMCCHEM_PATH="$PWD" ; cd -
   set +u
   export C_INCLUDE_PATH="${C_INCLUDE_PATH}":./
   set -e
@@ -12,13 +13,13 @@ function _install()
   ./configure --without-libsodium
   make -j 8
   cd - 
-  rm -f -- ../lib/libzmq.a ../lib/libzmq.so ../lib/libzmq.so.$LIBVERSION
-# cp "${BUILD}"/.libs/libzmq.a ../lib/ 
-# cp "${BUILD}"/.libs/libzmq.so ../lib/libzmq.so.$LIBVERSION	
-  cp "${BUILD}"/src/.libs/libzmq.a ../lib/ 
-  cp "${BUILD}"/src/.libs/libzmq.so ../lib/libzmq.so.$LIBVERSION
-  cp "${BUILD}"/include/{zmq,zmq_utils}.h ../lib/
-  cd ../lib
+  rm -f -- "${QMCCHEM_PATH}"/lib/libzmq.{a,so,so.$LIBVERSION} 
+# cp "${BUILD}"/.libs/libzmq.a "${QMCCHEM_PATH}"/lib/ 
+# cp "${BUILD}"/.libs/libzmq.so "${QMCCHEM_PATH}"/lib/libzmq.so.$LIBVERSION	
+  cp "${BUILD}"/src/.libs/libzmq.a "${QMCCHEM_PATH}"/lib/ 
+  cp "${BUILD}"/src/.libs/libzmq.so "${QMCCHEM_PATH}"/lib/libzmq.so.$LIBVERSION
+  cp "${BUILD}"/include/{zmq,zmq_utils}.h "${QMCCHEM_PATH}"/lib/
+  cd "${QMCCHEM_PATH}"/lib
   ln libzmq.so.$LIBVERSION libzmq.so || cp libzmq.so.$LIBVERSION libzmq.so
   cd -
   return 0