net/ipgrab: fix build with clang

- Fix build with clang
- NOPORTDOCS -> PORT_OPTIONS:MDOCS
- Unmute install commands
- Trim Makefile header

Approved by:	culot / jpaetzel (mentors, implicit)

net/ipgrab/Makefile

@@ -1,9 +1,5 @@
-# New ports collection makefile for:	ipgrab
-# Date created:				23. January 2004
-# Whom:					Aaron Zauner <az_mail@gmx.at>
-#
+# Created by: Aaron Zauner <az_mail@gmx.at>
 # $FreeBSD$
-#
 
 PORTNAME=	ipgrab
 PORTVERSION=	0.9.10
@@ -16,6 +12,7 @@ COMMENT=	IPgrab is a verbose packet sniffer for UNIX hosts
 BUILD_DEPENDS=	${LOCALBASE}/include/pcap.h:${PORTSDIR}/net/libpcap
 
 GNU_CONFIGURE=	yes
+USE_CSTD=	gnu89
 INFO=		ipgrab
 MAN8=		ipgrab.8
 DOCS=		README AUTHORS COPYING ChangeLog \
@@ -26,13 +23,15 @@ PLIST_FILES=	bin/ipgrab
 PORTDOCS=	README AUTHORS COPYING ChangeLog DEVELOPER-HOWTO \
 		INSTALL NEWS TODO
 
+.include <bsd.port.options.mk>
+
 do-install:
-	@${INSTALL_MAN} ${MAN8:S,^,${WRKSRC}/doc/,} ${MANPREFIX}/man/man8/
-	@${INSTALL_DATA} ${WRKSRC}/doc/ipgrab.info ${PREFIX}/info/
-	@${INSTALL_PROGRAM} ${WRKSRC}/src/ipgrab ${PREFIX}/bin/
-.if !defined(NOPORTDOCS)
+	${INSTALL_MAN} ${MAN8:S,^,${WRKSRC}/doc/,} ${MANPREFIX}/man/man8/
+	${INSTALL_DATA} ${WRKSRC}/doc/ipgrab.info ${PREFIX}/info/
+	${INSTALL_PROGRAM} ${WRKSRC}/src/ipgrab ${PREFIX}/bin/
+.if ${PORT_OPTIONS:MDOCS}
 	@${MKDIR} ${DOCSDIR}
-	@${INSTALL_DATA} ${PORTDOCS:S,^,${WRKSRC}/,} ${DOCSDIR}/
+	${INSTALL_DATA} ${PORTDOCS:S,^,${WRKSRC}/,} ${DOCSDIR}/
 .endif
 
 .include <bsd.port.mk>

net/ipgrab/files/patch-src_icmpv6.c

@@ -0,0 +1,13 @@
+diff --git src/icmpv6.c src/icmpv6.c
+index 90a41cc..9b123ce 100644
+--- src/icmpv6.c
++++ src/icmpv6.c
+@@ -205,7 +205,7 @@ void dump_icmpv6(packet_t *pkt)
+     case ICMPV6_TYPE_NEIGHBORSOLICIT:
+       /* Skip 4 unused bytes */
+       if ( skip_packet_bytes (pkt,4) == 0 )
+-         return 0;
++         return;
+ 
+       /* Next 16 bytes are an IPv6 address */
+       if (get_packet_bytes((u_int8_t *) &v6addr, pkt, 16) == 0)