diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f125ab6..75f2f5e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -33,10 +33,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: 'Install additional dependencies'
-        run: |
-          sudo apt-get update
-          sudo apt-get install libcdd-dev
       - uses: gap-actions/setup-gap@v2
         with:
           GAPBRANCH: ${{ matrix.gap-branch }}
@@ -53,11 +49,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-      - name: 'Install additional dependencies'
-        run: |
-          sudo apt-get update
-          sudo apt-get install libcdd-dev
       - uses: gap-actions/setup-gap@v2
       - uses: gap-actions/build-pkg-docs@v1
         with:
diff --git a/install.sh b/install.sh
index 19d7c53..1e7d99b 100755
--- a/install.sh
+++ b/install.sh
@@ -9,56 +9,12 @@ else
     gap_path=../..
 fi
 
-current_dir=$(pwd)
-cd $gap_path
-
-if [ -f "sysinfo.gap" ]; then
-    echo "Ok, thanks I found the gap installation."
-else
-    echo "ERROR: It seems that the given location for gap installation is not correct."
-    echo "The given location is $(pwd)."
-    exit 1
-fi
-
-cd $current_dir
-
-echo "## Setting variables"
-echo "I am now in $(pwd)"
-
-cddlib_VERSION=0.94m
-#cddlib_SHA256=?
-cddlib_BASE=cddlib-${cddlib_VERSION}
-cddlib_TAR=${cddlib_BASE}.tar.gz
-cddlib_URL=https://github.com/cddlib/cddlib/releases/download/${cddlib_VERSION}/${cddlib_TAR}
-
-echo
-echo "##"
-echo "## downloading ${cddlib_TAR}"
-echo "##"
-
-rm -rf cddlib*
-rm -rf current_cddlib
-etc/download.sh ${cddlib_URL}
-tar xvf ${cddlib_TAR}
-ln -sf $current_dir/${cddlib_BASE} $current_dir/current_cddlib
-rm -rf ${cddlib_TAR}
-
-echo "##"
-echo "## compiling cddlib ${cddlib_VERSION}"
-echo "##"
-
-cd ${cddlib_BASE}
-mkdir build
-./bootstrap
-./configure --prefix=$(pwd)/build
-make
-make install
+./prerequisites.sh ${gap_path}
 
 echo "##"
 echo "## compiling cdd interface"
 echo "##"
 
-cd $current_dir
 ./autogen.sh
 ./configure --with-gaproot=${gap_path} --with-cddlib=$(pwd)/current_cddlib/build
 make
diff --git a/prerequisites.sh b/prerequisites.sh
new file mode 100755
index 0000000..9953bc5
--- /dev/null
+++ b/prerequisites.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+set -e # abort upon error
+
+if [ "$#" -ge 1 ]; then
+    gap_path=$1
+    shift
+else
+    gap_path=../..
+fi
+
+current_dir=$PWD
+cd $gap_path
+
+if [ -f "sysinfo.gap" ]; then
+    echo "Ok, thanks I found the gap installation."
+else
+    echo "ERROR: It seems that the given location for gap installation is not correct."
+    echo "The given location is $PWD."
+    exit 1
+fi
+
+cd $current_dir
+
+echo "## Setting variables"
+echo "I am now in $PWD"
+
+cddlib_VERSION=0.94m
+#cddlib_SHA256=?
+cddlib_BASE=cddlib-${cddlib_VERSION}
+cddlib_TAR=${cddlib_BASE}.tar.gz
+cddlib_URL=https://github.com/cddlib/cddlib/releases/download/${cddlib_VERSION}/${cddlib_TAR}
+
+echo
+echo "##"
+echo "## downloading ${cddlib_TAR}"
+echo "##"
+
+rm -rf cddlib*
+rm -rf current_cddlib
+etc/download.sh ${cddlib_URL}
+tar xvf ${cddlib_TAR}
+ln -sf $current_dir/${cddlib_BASE} $current_dir/current_cddlib
+rm -rf ${cddlib_TAR}
+
+echo "##"
+echo "## compiling cddlib ${cddlib_VERSION}"
+echo "##"
+
+cd ${cddlib_BASE}
+mkdir build
+./bootstrap
+./configure --prefix=$PWD/build
+make
+make install