Index: Makefile
===================================================================
--- Makefile	(revision 387120)
+++ Makefile	(working copy)
@@ -13,11 +13,29 @@
 BUILD_DEPENDS=	${LOCALBASE}/bin/escript:${PORTSDIR}/lang/erlang
 RUN_DEPENDS:=	${BUILD_DEPENDS}
 
+OPTIONS_DEFINE=	BASH ZSH
+
 USE_GITHUB=	yes
 
 PLIST_FILES=	bin/${PORTNAME}
 
+.include <bsd.port.options.mk>
+
+.if ${PORT_OPTIONS:MBASH}
+PLIST_FILES+=	share/bash-completion/completions/rebar
+.endif
+
+.if ${PORT_OPTIONS:MZSH}
+PLIST_FILES+=	share/zsh/site-functions/_rebar
+.endif
+
 do-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin/
+	@${MKDIR} ${STAGEDIR}${PREFIX}/share/zsh/site-functions/
+	${INSTALL_DATA} ${WRKSRC}/priv/shell-completion/zsh/_rebar \
+		${STAGEDIR}${PREFIX}/share/zsh/site-functions/
+	@${MKDIR} ${STAGEDIR}${PREFIX}/share/bash-completion/completions
+	${INSTALL_DATA} ${WRKSRC}/priv/shell-completion/bash/rebar \
+		${STAGEDIR}${PREFIX}/share/bash-completion/completions/rebar
 
 .include <bsd.port.mk>