diff --git a/config.sub b/config.sub
index 6c9012dfce..d8d47316e4 100755
--- a/config.sub
+++ b/config.sub
@@ -430,7 +430,8 @@ esac
 # verify that the os is known, if it exists.
 
 case "${os}" in
-aix* | aout | bout | bsd* | coff | ctix* | dgux* | dynix* | esix* | hpux* \
+aix* | aout | bout | bsd* | coff | ctix* | dgux* | dynix* | esix* \
+	| ebmon | hpux* \
 	| hds | irix* | isc* | kern | mach* | msdos* | newsos* | nindy* | none \
 	| osf* | sco* | sunos* | sysv* | ultrix* | unos* | v88r* \
 	| vms* | vxworks* | sym[1-9]* | unicos* | uts | svr4 \