Index: head/lang/rust-nightly/Makefile
===================================================================
--- head/lang/rust-nightly/Makefile	(revision 489131)
+++ head/lang/rust-nightly/Makefile	(revision 489132)
@@ -1,36 +1,42 @@
 # Created by: Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
 # $FreeBSD$
 
 PORTVERSION=	1.33.0.${NIGHTLY_DATE:C,-,,g}
 PKGNAMESUFFIX=	-nightly
 DISTNAME=	rustc-nightly-src
 
 MASTERDIR=	${.CURDIR}/../rust
 PATCHDIR=	${.CURDIR}/files
 DISTINFO_FILE=	${.CURDIR}/distinfo
 
 CONFLICTS_INSTALL=	rust
 
 # Which source to pull:
 #   https://static.rust-lang.org/dist/${NIGHTLY_DATE}/rustc-nightly-src.tar.gz
 #   https://static.rust-lang.org/dist/channel-rust-nightly.toml
 NIGHTLY_DATE=			2019-01-03
 NIGHTLY_SUBDIR=			${NIGHTLY_DATE}/
 
 # See WRKSRC/src/stage0.txt for this date
 BOOTSTRAPS_DATE=		2018-12-09
 RUST_BOOTSTRAP_VERSION=		beta
 CARGO_BOOTSTRAP_VERSION=	beta
 
 CARGO_VENDOR_DIR=	${WRKSRC}/vendor
 
 # Other bootstraps aren't provided by upstream yet
 ONLY_FOR_ARCHS=			amd64 i386
 
 post-patch:	nightly-post-patch
 nightly-post-patch:
 # Work around unused_unsafe errors in libcore with stage0
 # https://github.com/rust-lang/rust/pull/57184
 	@${REINPLACE_CMD} '/RUSTC_DENY_WARNINGS/d' ${WRKSRC}/src/bootstrap/builder.rs
 
+post-configure:	nightly-post-configure
+nightly-post-configure:
+# Don't abort if optional tools fail to build
+# https://github.com/rust-lang/rust/commit/53254a888b42
+	@${ECHO_CMD} 'missing-tools = true' >>${WRKSRC}/config.toml
+
 .include "${MASTERDIR}/Makefile"