diff --git a/.gitignore b/.gitignore
index 4fce3b1..e19bdf7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -95,4 +95,5 @@ examples/*.fits
 examples/*.xml
 examples/*.dat
 examples/ctools
-pkgbuild
+pkg_build
+pkg_check
diff --git a/Makefile.am b/Makefile.am
index 28a9089..441b226 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -94,7 +94,7 @@ help:
 pkg:
 	@case `uname -s` in \
 		Darwin*) \
-			echo "Darwin supported"; \
+			echo "Build Mac OS X installation image"; \
 			dev/pkgbuild-macosx.sh $(PACKAGE_VERSION); \
 			;; \
 		Linux*) \
@@ -118,7 +118,8 @@ pkg:
 pkgcheck:
 	@case `uname -s` in \
 		Darwin*) \
-			echo "Darwin supported"; \
+			echo "Check Mac OS X installation image"; \
+			dev/pkgcheck-macosx.sh $(PACKAGE_VERSION); \
 			;; \
 		Linux*) \
 			if type lsb_release >/dev/null 2>&1; then \
diff --git a/dev/pkgbuild-macosx.sh b/dev/pkgbuild-macosx.sh
index 499640c..9987019 100755
--- a/dev/pkgbuild-macosx.sh
+++ b/dev/pkgbuild-macosx.sh
@@ -42,7 +42,7 @@ CTOOLS=ctools-$VERSION
 # ============== #
 # Set parameters #
 # ============== #
-WRKDIR=$PWD/pkgbuild
+WRKDIR=$PWD/pkg_build
 INSTALLDIR=$WRKDIR/install
 SRCDIR=$WRKDIR/src
 PKGDIR=$WRKDIR/pkg
diff --git a/dev/pkgcheck-macosx.sh b/dev/pkgcheck-macosx.sh
new file mode 100755
index 0000000..81ff37c
--- /dev/null
+++ b/dev/pkgcheck-macosx.sh
@@ -0,0 +1,114 @@
+#!/bin/bash -f
+# ==========================================================================
+# ctools Mac OS X package validation
+#
+# Copyright (C) 2017 Juergen Knoedlseder
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# ==========================================================================
+
+# ============================================= #
+# Get ctools/GammaLib version from command line #
+# ============================================= #
+if [ $# -ne 1 ] ;  then
+    echo "Please specify ctools/GammaLib version in the form x.y.z"
+    exit 1
+fi
+VERSION=$1
+
+
+# =============================== #
+# Set software component versions #
+# =============================== #
+#CFITSIO=cfitsio3410
+#NCURSES=ncurses-6.0
+#READLINE=readline-7.0
+#GAMMALIB=gammalib-$VERSION
+CTOOLS=ctools-$VERSION
+
+
+# ============== #
+# Set parameters #
+# ============== #
+WRKDIR=$PWD/pkg_check
+PKGDIR=$PWD/pkg_build
+
+
+#INSTALLDIR=$WRKDIR/install
+#SRCDIR=$WRKDIR/src
+#PKGDIR=$WRKDIR/pkg
+#PRODDIR=$WRKDIR/prod
+#PLISTFILE=$PKGDIR/$CTOOLS-components.plist
+#DISTFILE=$PRODDIR/$CTOOLS.dist
+DMGFILE=$PKGDIR/$CTOOLS-macosx10.7.dmg
+
+
+# ====================== #
+# Clean package creation #
+# ====================== #
+umount $WRKDIR
+rm -rf $WRKDIR
+
+
+# ============================= #
+# Create package directory tree #
+# ============================= #
+mkdir -p $WRKDIR
+
+
+# ================================= #
+# Create Mac OS X RAM disk (488 MB) #
+# ================================= #
+DEVICE=$(hdiutil attach ram://1000000 -nomount)
+diskutil erasevolume HFS+ 'ctools-test' $DEVICE
+umount -f /Volumes/ctools-test
+#sudo diskutil enableOwnership $DEVICE       # You must be root for this command
+mount -t hfs $DEVICE $WRKDIR
+
+
+# =============== #
+# Install package #
+# =============== #
+echo $DMGFILE
+hdiutil attach $DMGFILE
+sudo installer -pkg /Volumes/$CTOOLS/$CTOOLS.pkg -target $WRKDIR # You must be root for this command
+hdiutil detach /Volumes/$CTOOLS
+
+
+# ================= #
+# Configure package #
+# ================= #
+env
+export GAMMALIB=$WRKDIR/usr/local/gamma
+source $GAMMALIB/bin/gammalib-init.sh
+export CTOOLS=$WRKDIR/usr/local/gamma
+source $CTOOLS/bin/ctools-init.sh
+echo
+echo
+env
+
+
+# ============ #
+# Test package #
+# ============ #
+python -c 'import gammalib; gammalib.test()'
+python -c 'import ctools; ctools.test()'
+
+
+# =============== #
+# Detach RAM disk #
+# =============== #
+#hdiutil detach $WRKDIR
+
diff --git a/src/ctools-setup.in b/src/ctools-setup.in
index f4359fb..2acf68b 100644
--- a/src/ctools-setup.in
+++ b/src/ctools-setup.in
@@ -26,8 +26,9 @@ fi
 #
 # Set parameters
 # ==============
-prefix="@prefix@"
-exec_prefix="@exec_prefix@"
+#prefix="@prefix@"
+prefix=$CTOOLS
+#exec_prefix="@exec_prefix@"
 ctools_bin="@bindir@"
 ctools_lib="@libdir@"
 uname_system=`uname`