diff --git a/release/Makefile.vm b/release/Makefile.vm
--- a/release/Makefile.vm
+++ b/release/Makefile.vm
@@ -282,7 +282,10 @@
 cloudware-release:
 .endif
 
+.if ${CLOUDWARE_TYPES:MAZURE}
+# Depends on non-portable date -v argument
 .include "${.CURDIR}/Makefile.azure"
+.endif
 .include "${.CURDIR}/Makefile.ec2"
 .include "${.CURDIR}/Makefile.firecracker"
 .include "${.CURDIR}/Makefile.gce"