diff --git a/.github/workflows/continuous-integration.yaml b/.github/workflows/continuous-integration.yaml
index 30ab5f4..574c999 100644
--- a/.github/workflows/continuous-integration.yaml
+++ b/.github/workflows/continuous-integration.yaml
@@ -24,7 +24,11 @@ jobs:
       matrix:
         os: ['macos-12', 'macos-13', 'macos-14']
         version: ['2.9.3']
-        prefix: ['/opt/local']
+        prefix: ['local']
+        include:
+          - os: 'macos-14'
+            version: '2.9.3'
+            prefix: 'package'
     runs-on: '${{ matrix.os }}'
     name: 'Install MacPorts'
     needs: 'run-testsuite'
@@ -33,14 +37,15 @@ jobs:
       - uses: ./
         id: 'macports'
         with:
-          parameters: 'testsuite/run-testsuite-on-${{ matrix.os }}.yaml'
+          parameters: 'testsuite/run-testsuite-on-${{ matrix.os }}-${{ matrix.prefix }}.yaml'
       - name: 'Validate installed MacPorts version'
         run: >-
           test "$(port version)" = 'Version: ${{ matrix.version }}'
       - name: 'Validate transmitted MacPorts prefix'
         run: >-
-          test "${{ steps.macports.outputs.prefix }}" = '${{ matrix.prefix }}'
+          test "${{ steps.macports.outputs.prefix }}" = '/opt/${{ matrix.prefix }}'
       - name: 'Validate transmitted MacPorts version'
         run: >-
           test "${{ steps.macports.outputs.version }}" = '${{ matrix.version }}'
+      - run: /opt/${{ matrix.prefix }}/bin/port version
       - run: port version
diff --git a/README.md b/README.md
index 1a055da..67922d8 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,8 @@ The configuration file is in YAML and has the following format:
 
 * `version: '2.9.3'` — The MacPorts version to install.
 * `prefix: '/opt/local'` — The installation prefix to install MacPorts to.
-  Currently the only supported value is '/opt/local'.
+  The default is `/opt/local` and only needs to be changed when
+  preparing self-install packages for instane.
 * `variants.select: []` — The list of selected variants in the global
   variants configuration. See Also variants.conf(5).
 * `variants.deselect: []` — The list of deselected variants in the
diff --git a/action.yaml b/action.yaml
index 66ad45a..888ed79 100644
--- a/action.yaml
+++ b/action.yaml
@@ -88,7 +88,9 @@ runs:
     - name: 'Install MacPorts'
       if: steps.cache-macports.outputs.cache-hit != 'true'
       shell: sh
-      env:
-        TOPLEVELDIR: ${{ github.action_path }}
       run: |
         ${{ github.action_path }}/install_macports
+      env:
+        TOPLEVELDIR: ${{ github.action_path }}
+        macports_prefix: ${{ steps.configure-macports.outputs.prefix }}
+        macports_version: ${{ steps.configure-macports.outputs.version }}
diff --git a/configure_macports b/configure_macports
index d733929..07489af 100755
--- a/configure_macports
+++ b/configure_macports
@@ -45,7 +45,7 @@ experimental()
 
 cache_key()
 {
-    openssl ripemd160 "${macports_prefix}/etc/gha-install-macports.yaml"\
+    openssl ripemd160 "${macports_prefix}/etc/setup-macports.yaml"\
 	| awk -v "macos=${macos}" '{print(macos "-" $2)}'
 }
 
@@ -101,8 +101,8 @@ main()
     esac
 
     if [ -f "${parameterfile}" -a -r "${parameterfile}" ]; then
-	version=$(yq ".version // \"${macports_version}\"" < "${parameterfile}")
-	prefix=$(yq ".prefix // \"${macports_prefix}\"" < "${parameterfile}")
+	macports_version=$(yq ".version // \"${macports_version}\"" < "${parameterfile}")
+	macports_prefix=$(yq ".prefix // \"${macports_prefix}\"" < "${parameterfile}")
     fi
 
     if [ "${action}" = 'experimental' ]; then
@@ -112,14 +112,14 @@ main()
 
     setup_path
     sudo install -d -o $(id -u -n) -g $(id -g -n) -m 755 "${macports_prefix}"
-    write_configuration "${parameterfile}" "${macports_prefix}/etc/gha-install-macports.yaml"
-    write_variants "${macports_prefix}/etc/gha-install-macports.yaml"
-    write_sources "${macports_prefix}/etc/gha-install-macports.yaml"
+    write_configuration "${parameterfile}" "${macports_prefix}/etc/setup-macports.yaml"
+    write_variants "${macports_prefix}/etc/setup-macports.yaml"
+    write_sources "${macports_prefix}/etc/setup-macports.yaml"
 
     if [ "${GITHUB_ACTIONS}" = 'true' ]; then
 	{
 	    printf 'prefix=%s\n' "${macports_prefix}"
-	    printf 'parameters=%s\n' "${macports_prefix}/etc/gha-install-macports.yaml"
+	    printf 'parameters=%s\n' "${macports_prefix}/etc/setup-macports.yaml"
 	    printf 'cache-key=%sn\n' "$(cache_key)"
             printf 'package=%s\n' "$(make_package)"
             printf 'version=%s\n' "${macports_version}"
diff --git a/install_macports b/install_macports
index 7422ea1..f195d3e 100755
--- a/install_macports
+++ b/install_macports
@@ -162,6 +162,24 @@ fetch_and_install_package()
     sudo chown -R $(id -u -n):$(id -g -n) "${macports_prefix}"
 }
 
+install_from_source()
+{
+    local srcdir
+    srcdir='/opt/local/src'
+    sudo install -d -o $(id -u -n) -g $(id -g -n) -m 755 "${srcdir}"
+    (
+	cd "${srcdir}"
+	git clone https://github.com/macports/macports-base.git
+	cd macports-base
+	git checkout "v${macports_version}"
+	./configure --enable-readline --prefix="${macports_prefix}"
+	make
+	sudo make install
+    )
+    sudo rm -Rf "${srcdir}"
+    sudo port -v selfupdate
+}
+
 install_ports()
 {
     ports_document "$1" | xargs -J '%' sudo port install '%'
@@ -208,8 +226,13 @@ main()
 	'Configuration Summary'\
 	configuration_summary
 
-    fetch_and_install_package "$(make_package)"
-    install_ports "${macports_prefix}/etc/gha-install-macports.yaml"
+    if [ "${macports_prefix}" = '/opt/local' ]; then
+	fetch_and_install_package "$(make_package)"
+    else
+	install_from_source
+    fi
+	
+    install_ports "${macports_prefix}/etc/setup-macports.yaml"
 }
 
 main "$@"
diff --git a/subr/macports.sh b/subr/macports.sh
index 942090b..ab7f304 100644
--- a/subr/macports.sh
+++ b/subr/macports.sh
@@ -62,7 +62,7 @@ YAML
 variants_document()
 {
     if [ "$#" -eq 0 ]; then
-	set -- "${macports_prefix}/etc/gha-install-macports.yaml"
+	set -- "${macports_prefix}/etc/setup-macports.yaml"
     fi
 
     printf '# MacPorts system-wide global variants configuration file.\n'
@@ -82,7 +82,7 @@ variants_document()
 ports_document()
 {
     if [ "$#" -eq 0 ]; then
-	set -- "${macports_prefix}/etc/gha-install-macports.yaml"
+	set -- "${macports_prefix}/etc/setup-macports.yaml"
     fi
 
     yq '
@@ -100,7 +100,7 @@ ports_document()
 sources_document()
 {
     if [ "$#" -eq 0 ]; then
-	set -- "${macports_prefix}/etc/gha-install-macports.yaml"
+	set -- "${macports_prefix}/etc/setup-macports.yaml"
     fi
 
     yq '
@@ -131,7 +131,7 @@ make_package()
     case $# in
 	0)
 	    macos=$(probe_macos)
-	    version=$(yq ".version // \"${macports_version}\"" < "${macports_prefix}/etc/gha-install-macports.yaml")
+	    version=$(yq ".version // \"${macports_version}\"" < "${macports_prefix}/etc/setup-macports.yaml")
 	    ;;
 	1)
 	    macos=$(probe_macos)
diff --git a/testsuite/run-testsuite-on-macos-12.yaml b/testsuite/run-testsuite-on-macos-12-local.yaml
similarity index 100%
rename from testsuite/run-testsuite-on-macos-12.yaml
rename to testsuite/run-testsuite-on-macos-12-local.yaml
diff --git a/testsuite/run-testsuite-on-macos-13.yaml b/testsuite/run-testsuite-on-macos-13-local.yaml
similarity index 100%
rename from testsuite/run-testsuite-on-macos-13.yaml
rename to testsuite/run-testsuite-on-macos-13-local.yaml
diff --git a/testsuite/run-testsuite-on-macos-14.yaml b/testsuite/run-testsuite-on-macos-14-local.yaml
similarity index 100%
rename from testsuite/run-testsuite-on-macos-14.yaml
rename to testsuite/run-testsuite-on-macos-14-local.yaml
diff --git a/testsuite/run-testsuite-on-macos-14-package.yaml b/testsuite/run-testsuite-on-macos-14-package.yaml
new file mode 100644
index 0000000..d4ae141
--- /dev/null
+++ b/testsuite/run-testsuite-on-macos-14-package.yaml
@@ -0,0 +1,15 @@
+version: '2.9.3'
+prefix: '/opt/package'
+variants:
+  select:
+    - aqua
+    - metal
+  deselect: x11
+ports:
+  - name: db48
+    deselect: [ java ]
+    select: [ tcl, universal ]
+  - name: gmp
+    select: native
+  - name: dbus
+
diff --git a/validate_configuration b/validate_configuration
index 1e9f5fb..24a190e 100755
--- a/validate_configuration
+++ b/validate_configuration
@@ -69,10 +69,6 @@ main()
     if [ ! -r "$1" ]; then
 	failwith 'The pathname \047%s\047 does not designate a readable file.' "$1"
     fi
-
-    if ! [ $(yq '.prefix' "$1") = '/opt/local' ]; then
-	failwith 'The only supported prefix is \047/opt/local\047.'
-    fi
 }
 
 main "$@"