Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -2106,6 +2106,7 @@
 .endif
 
 .include "${PORTSDIR}/Mk/bsd.ccache.mk"
+.include "${PORTSDIR}/Mk/bsd.sccache.mk"
 
 .if !make(makesum)
 FETCH_ENV?=		SSL_NO_VERIFY_PEER=1 SSL_NO_VERIFY_HOSTNAME=1
@@ -5306,7 +5307,7 @@
 				300:pre-configure 450:pre-configure-script \
 				490:run-autotools-fixup 500:do-configure 700:post-configure \
 				850:post-configure-script \
-				${_OPTIONS_configure} ${_USES_configure}
+				${_OPTIONS_configure} ${_USES_configure} ${_SCCACHE_START_SEQ}
 _BUILD_DEP=		configure
 _BUILD_SEQ=		100:build-message 300:pre-build 450:pre-build-script \
 				500:do-build 700:post-build 850:post-build-script \
@@ -5324,7 +5325,7 @@
 				900:add-plist-info 910:add-plist-docs 920:add-plist-examples \
 				930:add-plist-data 940:add-plist-post ${POST_PLIST:C/^/990:/} \
 				${_OPTIONS_install} ${_USES_install} \
-				${_OPTIONS_stage} ${_USES_stage}
+				${_OPTIONS_stage} ${_USES_stage} ${_SCCACHE_STOP_SEQ}
 .if defined(DEVELOPER)
 _STAGE_SEQ+=	995:stage-qa
 .else
Index: Mk/bsd.sccache.mk
===================================================================
--- /dev/null
+++ Mk/bsd.sccache.mk
@@ -0,0 +1,59 @@
+# Note: the binary needs to be provided by the system, as to avoid a
+# chicken-egg problem in lang/rust, which itself can greatly benefit from being
+# compiled using sccache.
+#
+# User settable:
+#
+# - SCCACHE_DIR		- path to the sccache directory
+# - SCCACHE_BIN		- path to the sccache binary - defaults to ${SCCACHE_DIR}/sccache
+#                         this makes it easy to inject sccache into poudriere
+# - SCCACHE_SIZE	- size of the cache - defaults to 16G
+#
+# Usable by ports:
+#
+# - SCCACHE_ENABLED - set if SCCACHE is usable (read only)
+# - NO_SCCACHE      - disable sccache for the port (write only)
+#
+
+COMMANDS_Include_MAINTAINER=	portmgr@FreeBSD.org
+
+.if !defined(_SCCACHE_INCLUDED)
+_SCCACHE_INCLUDED=	yes
+_SCCACHE_SIZE_DEFAULT=	16G
+
+.  if defined(SCCACHE_DIR)
+SCCACHE_BIN?=		${SCCACHE_DIR}/sccache
+.  endif
+
+.  if !defined(NO_SCCACHE)
+.    if defined(SCCACHE_BIN) && exists(${SCCACHE_BIN})
+SCCACHE_ENABLED=	y
+SCCACHE_SIZE?=		${_SCCACHE_SIZE_DEFAULT}
+
+_SCCACHE_ENV=		RUSTC_WRAPPER="${SCCACHE_BIN}" \
+			SCCACHE_DIR="${SCCACHE_DIR}" \
+			SCCACHE_CACHE_SIZE="${SCCACHE_SIZE}" \
+			SCCACHE_MAX_FRAME_LENGTH=104857600
+
+CONFIGURE_ENV+=		${_SCCACHE_ENV}
+MAKE_ENV+=		${_SCCACHE_ENV}
+
+# Added to _CONFIGURE_SEQ
+_SCCACHE_START_SEQ=	450:sccache-start
+# Added to _STAGE_SEQ
+_SCCACHE_STOP_SEQ=	950:sccache-stop
+
+# Enusure that the sccache is properly stopped when stopping the build
+sccache-start:
+	@echo "==========================================================================="
+	@echo "==> starting sccache"
+	@${SETENV} ${_SCCACHE_ENV} ${SCCACHE_BIN} --start-server
+	@echo "==========================================================================="
+sccache-stop:
+	@echo "==========================================================================="
+	@echo "==> stopping sccache"
+	@${SETENV} ${_SCCACHE_ENV} ${SCCACHE_BIN} --stop-server
+	@echo "==========================================================================="
+.    endif
+.  endif
+.endif
Index: lang/rust/Makefile
===================================================================
--- lang/rust/Makefile
+++ lang/rust/Makefile
@@ -161,6 +161,9 @@
 	@${ECHO_CMD} 'target=[${_RUST_TARGETS:@.target.@"${.target.}"@:ts,}]' >> ${WRKSRC}/config.toml
 	@${ECHO_CMD} 'cargo="${WRKDIR}/bootstrap/bin/cargo"' >> ${WRKSRC}/config.toml
 	@${ECHO_CMD} 'rustc="${WRKDIR}/bootstrap/bin/rustc"' >> ${WRKSRC}/config.toml
+.if defined(SCCACHE_ENABLED)
+	@${ECHO_CMD} 'rustc-wrapper="${SCCACHE_BIN}"' >> ${WRKSRC}/config.toml
+.endif
 	@${ECHO_CMD} 'tools=[${_RUST_TOOLS:@.tool.@"${.tool.}"@:ts,}]' >> ${WRKSRC}/config.toml
 	@${ECHO_CMD} '[install]' >> ${WRKSRC}/config.toml
 	@${ECHO_CMD} 'prefix="${PREFIX}"' >> ${WRKSRC}/config.toml
@@ -221,6 +224,18 @@
 	@${ECHO_CMD} 'missing-tools=true' >> ${WRKSRC}/config.toml
 .endif
 
+.if defined(SCCACHE_ENABLE)
+EXTRA_PATCHES+=	${FILES_DIR}/extra-patch-sccache
+.endif
+
+pre-configure:
+.if defined(SCCACHE_ENABLE)
+	${REINPLACE_CMD} -e 's|%%SCCACHE_DIR%%|${SCCACHE_DIR}|' \
+		         -e 's|%%SCCACHE_BIN%%|${SCCACHE_BIN}|' \
+			 -e 's|%%SCCACHE_SIZE%%|${SCCACHE_SIZE}|' \
+			 ${CONFIGURE_WRKSRC}/src/bootstrap/builder.rs
+.endif
+
 do-build:
 	@cd ${WRKSRC} && \
 		${SETENV} ${MAKE_ENV} ${PYTHON_CMD} x.py build --jobs=${MAKE_JOBS_NUMBER}
Index: lang/rust/files/extra-patch-sccache
===================================================================
--- /dev/null
+++ lang/rust/files/extra-patch-sccache
@@ -0,0 +1,12 @@
+--- src/bootstrap/builder.rs.orig	2021-07-20 13:51:10 UTC
++++ src/bootstrap/builder.rs
+@@ -1068,6 +1068,9 @@ impl<'a> Builder<'a> {
+         if cmd != "clippy" {
+             cargo.env("RUSTC", self.out.join("bootstrap/debug/rustc"));
+         }
++        cargo.env("RUSTC_WRAPPER", "%%SCCACHE_BIN%%");
++        cargo.env("SCCACHE_DIR", "%%SCCACHE_DIR%%");
++        cargo.env("SCCACHE_CACHE_SIZE", "%%SCCACHE_SIZE%%");
+ 
+         // Dealing with rpath here is a little special, so let's go into some
+         // detail. First off, `-rpath` is a linker option on Unix platforms