belle-sip: make this get past the configure step

Doesn't build though:

/usr/pkg/java/openjdk11/bin/java -Xmx256m -jar /usr/pkg/share/java/classes/antlr.jar  -make -Xmultithreaded -Xconversiontimeout 10000 -fo  . ./belle_sip_message.g
no main manifest attribute, in /usr/pkg/share/java/classes/antlr.jar

belle-sip/DESCR

@@ -1 +1,2 @@
-Belle-sip is a SIP (RFC3261) implementation written in C, with an object oriented API.
+Belle-sip is a SIP (RFC3261) implementation written in C, with an
+object oriented API.

belle-sip/Makefile

@@ -11,10 +11,20 @@ LICENSE=	gnu-gpl-v2
 
 GNU_CONFIGURE=	yes
 USE_LIBTOOL=	yes
-USE_TOOLS+=	pkg-config
+USE_TOOLS+=	gmake pkg-config
 USE_LANGUAGES=	c c++
 
+MAKE_JOBS_SAFE=	no
+
 PKGCONFIG_OVERRIDE+=	belle-sip.pc.in
 
+SUBST_CLASSES+=		jar
+SUBST_SED.jar+=		-e 's,/opt/local/share/java,${PREFIX}/share/java/classes,'
+SUBST_FILES.jar+=	configure
+SUBST_STAGE.jar=	pre-configure
+SUBST_MESSAGE.jar=	Fixing path to Java class.
+
+.include "../../wip/antlr/buildlink3.mk"
 .include "../../wip/antlr3-c/buildlink3.mk"
+.include "../../mk/java-vm.mk"
 .include "../../mk/bsd.pkg.mk"

belle-sip/TODO

@@ -0,0 +1,4 @@
+Fails to build:
+
+/usr/pkg/java/openjdk11/bin/java -Xmx256m -jar /usr/pkg/share/java/classes/antlr.jar  -make -Xmultithreaded -Xconversiontimeout 10000 -fo  . ./belle_sip_message.g
+no main manifest attribute, in /usr/pkg/share/java/classes/antlr.jar

belle-sip/buildlink3.mk

@@ -0,0 +1,14 @@
+# $NetBSD$
+
+BUILDLINK_TREE+=	belle-sip
+
+.if !defined(BELLE_SIP_BUILDLINK3_MK)
+BELLE_SIP_BUILDLINK3_MK:=
+
+BUILDLINK_API_DEPENDS.belle-sip+=	belle-sip>=1.4.2
+BUILDLINK_PKGSRCDIR.belle-sip?=		../../wip/belle-sip
+
+#.include "../../wip/antlr3-c/buildlink3.mk"
+.endif	# BELLE_SIP_BUILDLINK3_MK
+
+BUILDLINK_TREE+=	-belle-sip