Customize cloning to include tags so that VERSION is valid.

.cirrus.yml

@@ -10,7 +10,11 @@ task:
   install_script:
     - sed -i.bak -e 's,pkg+http://pkg.FreeBSD.org/\${ABI}/quarterly,pkg+http://pkg.FreeBSD.org/\${ABI}/latest,' /etc/pkg/FreeBSD.conf
     - pkg upgrade -y
-    - pkg install -y autoconf gmake
+    - pkg install -y autoconf git gmake
+  clone_script:
+    - git clone --tags --branch=${CIRRUS_BASE_BRANCH} https://x-access-token:${CIRRUS_REPO_CLONE_TOKEN}@github.com/${CIRRUS_REPO_FULL_NAME}.git ${CIRRUS_WORKING_DIR}
+    - git fetch origin ${CIRRUS_BRANCH}/head:${CIRRUS_BRANCH}
+    - git checkout ${CIRRUS_BRANCH}
   script:
     - autoconf
     #- ./configure ${COMPILER_FLAGS:+       CC="$CC $COMPILER_FLAGS"       CXX="$CXX $COMPILER_FLAGS" }       $CONFIGURE_FLAGS