diff --git a/matrix/synapse_version.sh b/matrix/synapse_version.sh
new file mode 100755
index 0000000..8a27275
--- /dev/null
+++ b/matrix/synapse_version.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+# 2026-08-10, Nico Schottelius
+
+if [ $# -ne 1 ]; then
+    echo $0: matrix-server
+    exit 1
+fi
+
+server=$1; shift
+url=https://${server}/_synapse/admin/v1/server_version
+
+curl "${url}"
diff --git a/opennebula-images/alpine-build-opennebula-image.sh b/opennebula-images/alpine-build-opennebula-image.sh
index 865c882..77b5488 100755
--- a/opennebula-images/alpine-build-opennebula-image.sh
+++ b/opennebula-images/alpine-build-opennebula-image.sh
@@ -48,6 +48,8 @@ if [ "$(lsb_release --short --id)" != "Alpine" ]; then
 	sleep 5
 fi
 
+echo "Build host requirements: apk add curl sfdisk qemu-img e2fsprogs"
+
 # Create base QCOW2 image.
 qemu-img create -f qcow2 "$IMAGE_PATH" "$IMAGE_SIZE"
 modprobe nbd max_part=16