diff --git a/devel/ztcl/Makefile b/devel/ztcl/Makefile
index 4f6e60c82882..852fa4bcd451 100644
--- a/devel/ztcl/Makefile
+++ b/devel/ztcl/Makefile
@@ -1,40 +1,46 @@
 # New ports collection makefile for:	ztcl
 # Date created:				Tue Apr 25 17:49:31 MSD 2006
 # Whom:					Denis Shaposhnikov <dsh@vlink.ru>
 #
 # $FreeBSD$
 #
 
 PORTNAME=	ztcl
 DISTVERSION=	1.0b4
 CATEGORIES=	devel tcl84
 MASTER_SITES=	http://download.gna.org/ztcl/1.0/
 DISTNAME=	${PORTNAME}_${DISTVERSION}_src
 
 MAINTAINER=	dsh@vlink.ru
 COMMENT=	A zlib extension library for the Tcl
 
 LIB_DEPENDS=	tclmore0.7:${PORTSDIR}/devel/tclmore
 # USE_TCL only gives run dependency
 BUILD_DEPENDS=	${RUN_DEPENDS}
 
 GNU_CONFIGURE=	yes
 INSTALLS_SHLIB=	yes
 USE_GMAKE=	yes
 USE_TCL=	yes
 WRKSRC=		${WRKDIR}/${DISTNAME:S/_src$//}
 
 INFO=		${PORTNAME} ${PORTNAME}-zlib
 
 CONFIGURE_ARGS+=	--with-tcl=${TCL_LIBDIR} \
 		--with-tclinclude=${TCL_INCLUDEDIR} \
 		--with-tclmorescripts=${PREFIX}/libexec/tclmore
 CONFIGURE_ENV+=	CPPFLAGS="${CPPFLAGS} -I ${PREFIX}/include -I ${TCL_INCLUDEDIR}" \
 		LDFLAGS="${LDFLAGS} -L ${PREFIX}/lib"
 MAKE_ENV+=	CPPFLAGS="${CPPFLAGS} -I ${PREFIX}/include -I ${TCL_INCLUDEDIR}" \
 		LDFLAGS="${LDFLAGS} -L ${PREFIX}/lib"
 
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} < 500000
+BROKEN=		Does not compile on FreeBSD 4.X
+.endif
+
 post-extract:
 	${MV} ${WRKSRC}/doc/zlib.texi ${WRKSRC}/doc/${PORTNAME}-zlib.texi
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>