diff --git a/defs.sh b/defs.sh
new file mode 100644
index 00000000..33485023
--- /dev/null
+++ b/defs.sh
@@ -0,0 +1,29 @@
+
+echo sdg
+
+set -o nounset
+set -o errexit
+
+if [ ! -n "$0" ]; then
+	TOOLS_PATH=$(dirname $(which $0));
+	IMAGE_DIR="."
+else
+	TOOLS_PATH=$PWD
+fi
+
+TOOLS_BIN_PATH=$TOOLS_PATH/bin
+TOOLS_INC_PATH=$TOOLS_PATH/include
+TOOLS_LIB_PATH=$TOOLS_PATH/lib
+TOOLS_SRC_PATH=$TOOLS_PATH/src
+TOOLS_LOG_PATH=$TOOLS_PATH/logs
+
+LIB_PATH="/usr/local/lib"
+INC_PATH="/usr/local/include"
+
+BUNDLER_PATH="$TOOLS_SRC_PATH/bundler"
+CMVS_PATH="$TOOLS_SRC_PATH/cmvs"
+PMVS_PATH="$TOOLS_SRC_PATH/pmvs"
+GRACLUS_PATH="$TOOLS_SRC_PATH/graclus"
+CLAPACK_PATH="$TOOLS_SRC_PATH/clapack"
+OPENCV_PATH="$TOOLS_SRC_PATH/openCv"
+VLFEAT_PATH="$TOOLS_SRC_PATH/vlfeat"
\ No newline at end of file
diff --git a/install.sh b/install.sh
old mode 100644
new mode 100755
index 8f9afa11..de5589b4
--- a/install.sh
+++ b/install.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
-set -o nounset
-set -o errexit
+. ./defs.sh
 
 echo 
 echo "     created by Daniel Schwarz/daniel.schwarz@topoi.org"
@@ -17,25 +16,6 @@ echo "  - script started - `date`"
 ARCH=`uname -m`
 CORES=`ls -d /sys/devices/system/cpu/cpu[[:digit:]]* | wc -w`
 
-TOOLS_PATH=$PWD
-
-TOOLS_BIN_PATH=$TOOLS_PATH/bin
-TOOLS_INC_PATH=$TOOLS_PATH/include
-TOOLS_LIB_PATH=$TOOLS_PATH/lib
-TOOLS_SRC_PATH=$TOOLS_PATH/src
-TOOLS_LOG_PATH=$TOOLS_PATH/logs
-
-LIB_PATH="/usr/lib"
-INC_PATH="/usr/include"
-
-BUNDLER_PATH="$TOOLS_SRC_PATH/bundler"
-CMVS_PATH="$TOOLS_SRC_PATH/cmvs"
-PMVS_PATH="$TOOLS_SRC_PATH/pmvs"
-GRACLUS_PATH="$TOOLS_SRC_PATH/graclus"
-CLAPACK_PATH="$TOOLS_SRC_PATH/clapack"
-OPENCV_PATH="$TOOLS_SRC_PATH/openCv"
-VLFEAT_PATH="$TOOLS_SRC_PATH/vlfeat"
-
 ## removing old stuff
 rm -irf `ls -1 | egrep -v '\.zip$|\.tgz$|\.bz2$|\.gz$|\.sh$|^bin$' | xargs`
 rm -irf `find bin | egrep -v '\.pl$|^bin$' | xargs`