diff --git a/config/gfortran.cfg b/config/gfortran.cfg
index 50dd00d1..d84d8486 100644
--- a/config/gfortran.cfg
+++ b/config/gfortran.cfg
@@ -10,7 +10,7 @@
 #
 #
 [COMMON]
-FC           : gfortran -ffree-line-length-none 
+FC           : gfortran -ffree-line-length-none -I .
 LAPACK_LIB   : -lblas -llapack
 IRPF90       : irpf90
 IRPF90_FLAGS : --ninja --align=32
diff --git a/configure b/configure
index 05128976..b810f600 100755
--- a/configure
+++ b/configure
@@ -128,7 +128,7 @@ ezfio = Info(
 
 d_info = dict()
 
-for m in ["ocaml", "m4", "curl", "zlib", "path", "irpf90", "docopt", "gcc",
+for m in ["ocaml", "m4", "curl", "zlib", "path", "irpf90", "docopt", 
           "resultsFile", "ninja", "emsl", "ezfio"]:
     exec ("d_info['{0}']={0}".format(m))
 
diff --git a/install/scripts/install_ocaml.sh b/install/scripts/install_ocaml.sh
index 34410c62..5c9bb89e 100755
--- a/install/scripts/install_ocaml.sh
+++ b/install/scripts/install_ocaml.sh
@@ -32,7 +32,10 @@ export LIBRARY_PATH=${QP_ROOT}/lib:${LIBRARY_PATH}
 export C_INCLUDE_PATH=${QP_ROOT}/lib:${C_INCLUDE_PATH}
 source ${HOME}/.opam/opam-init/init.sh > /dev/null 2> /dev/null || true
 
-${QP_ROOT}/bin/opam install ${PACKAGES} -y -q || exit 1
+
+NCPUs=$(cat /proc/cpuinfo  | grep -i  MHz | wc -l)
+${QP_ROOT}/bin/opam install -j ${NCPUs} ${PACKAGES} -y -q || exit 1
+
 rm -f ../_build/ocaml.log
 exit 0
 
diff --git a/install/scripts/install_zlib.sh b/install/scripts/install_zlib.sh
index 26139f5c..06ce67f3 100755
--- a/install/scripts/install_zlib.sh
+++ b/install/scripts/install_zlib.sh
@@ -14,6 +14,8 @@ function _install()
   make install prefix=$QP_ROOT/install/${TARGET} || exit 1
   ln -s -f $QP_ROOT/install/${TARGET}/lib/libz.so $QP_ROOT/lib || exit 1
   ln -s -f $QP_ROOT/install/${TARGET}/lib/libz.a $QP_ROOT/lib || exit 1
+  ln -s -f $QP_ROOT/install/${TARGET}/include/zlib.h $QP_ROOT/lib || exit 1
+  ln -s -f $QP_ROOT/install/${TARGET}/include/zconf.h $QP_ROOT/lib || exit 1
 }
 
 source scripts/build.sh