Index: Mk/Uses/autoreconf.mk
===================================================================
--- Mk/Uses/autoreconf.mk
+++ Mk/Uses/autoreconf.mk
@@ -84,5 +84,6 @@
 .endif
 	@(cd ${CONFIGURE_WRKSRC} && ${LOCALBASE}/bin/autoreconf -f -i)
 .endif
+_USES_configure+=	470:do-autoreconf
 
 .endif
Index: Mk/Uses/charsetfix.mk
===================================================================
--- Mk/Uses/charsetfix.mk
+++ Mk/Uses/charsetfix.mk
@@ -22,5 +22,6 @@
 		-e 's|need_charset_alias=true|need_charset_alias=false|g ; \
 		s|test -f $$(charset_alias)|false|g ;\
 		s|test -f $$(DESTDIR)$$(libdir)/charset.alias|false|g'
+_USES_patch+=	600:charsetfix-post-patch
 
 .endif
Index: Mk/Uses/cran.mk
===================================================================
--- Mk/Uses/cran.mk
+++ Mk/Uses/cran.mk
@@ -70,11 +70,12 @@
 .endif
 
 .if ${cran_ARGS:Mauto-plist}
-.if !target(post-install-script)
-post-install-script:
+.if !target(cran-auto-plist)
+cran-auto-plist:
 	@${FIND} -ds ${STAGEDIR}${PREFIX}/${R_MOD_DIR} \( -type f -or -type l \) -print | \
 		${SED} -E -e 's,^${STAGEDIR}${PREFIX}/?,,' >> ${TMPPLIST}
 .endif
+_USES_install+=	750:cran-auto-plist
 .endif
 
 .endif #_INCLUDE_USES_CRAN_MK
Index: Mk/Uses/display.mk
===================================================================
--- Mk/Uses/display.mk
+++ Mk/Uses/display.mk
@@ -26,16 +26,12 @@
 XVFBPIDFILE=	/tmp/.xvfb-${XVFBPORT}.pid
 MAKE_ENV+=	DISPLAY=":${XVFBPORT}"
 
-.PHONY: start-display stop-display
-pre-${display_ARGS}: start-display
-
-post-${display_ARGS}: stop-display
-
-start-display:
+start-display::
 	daemon -p ${XVFBPIDFILE} Xvfb :${XVFBPORT}
 
-stop-display:
+stop-display::
 	pkill -15 -F ${XVFBPIDFILE}
 
+_USES_${display_ARGS}+=	290:start-display 860:stop-display
 .endif
 .endif
Index: Mk/Uses/kmod.mk
===================================================================
--- Mk/Uses/kmod.mk
+++ Mk/Uses/kmod.mk
@@ -39,7 +39,7 @@
 .if defined(_POSTMKINCLUDED) && !defined(_INCLUDE_USES_KMOD_POST_MK)
 _INCLUDE_USES_KMOD_POST_MK=	yes
 
-pre-install: ${STAGEDIR}${KMODDIR}
+_USES_install+=	290:${STAGEDIR}${KMODDIR}
 ${STAGEDIR}${KMODDIR}:
 	@${MKDIR} ${.TARGET}
 
Index: Mk/Uses/libtool.mk
===================================================================
--- Mk/Uses/libtool.mk
+++ Mk/Uses/libtool.mk
@@ -25,6 +25,7 @@
 .if defined(_POSTMKINCLUDED) && !defined(_INCLUDE_USES_LIBTOOL_POST_MK)
 _INCLUDE_USES_LIBTOOL_POST_MK=	yes
 
+_USES_configure+=	480:patch-libtool
 patch-libtool:
 	@${FIND} ${WRKDIR} \( -name configure -or -name ltconfig \)	\
 		-type f | while read i; do ${SED} -i.libtool.bak	\
@@ -60,6 +61,7 @@
 		-e '/if.*prog.*linkmode.*relink = .*mode/s/||.*;/;/'	\
 		-e 's/|-p|-pg|/|-B*|-fstack-protector*|-p|-pg|/'
 
+_USES_stage+=	790:patch-lafiles
 patch-lafiles:
 .if ${libtool_ARGS:Mkeepla}
 	@${FIND} ${STAGEDIR} -type f -name '*.la' |			\
Index: Mk/Uses/pathfix.mk
===================================================================
--- Mk/Uses/pathfix.mk
+++ Mk/Uses/pathfix.mk
@@ -18,6 +18,7 @@
 
 PATHFIX_MAKEFILEIN?=	Makefile.in
 
+_USES_patch+=	190:pathfix
 pathfix:
 	@${FIND} ${WRKSRC} -name "${PATHFIX_MAKEFILEIN}" -type f | ${XARGS} ${REINPLACE_CMD} -e \
 		's|[(]libdir[)]/locale|(prefix)/share/locale|g ; \
Index: Mk/Uses/perl5.mk
===================================================================
--- Mk/Uses/perl5.mk
+++ Mk/Uses/perl5.mk
@@ -274,6 +274,7 @@
 
 # In all those, don't use - before the command so that the user does
 # not wonder what has been ignored by this message "*** Error code 1 (ignored)"
+_USES_install+=	560:fix-perl-things
 fix-perl-things:
 # Remove STAGEDIR from .packlist and add the file to the plist.
 	@(if [ -d ${STAGEDIR}${PACKLIST_DIR} ] ; then \
Index: Mk/Uses/shebangfix.mk
===================================================================
--- Mk/Uses/shebangfix.mk
+++ Mk/Uses/shebangfix.mk
@@ -60,6 +60,7 @@
 _SHEBANG_REINPLACE_ARGS+=	-e "1s|^\#![[:space:]]*${${lang}_OLD_CMD}|\#!${${lang}_CMD}|"
 .endfor
 
+_USES_patch+=	210:fix-shebang
 fix-shebang:
 	@cd ${WRKSRC}; \
 		${ECHO_CMD} ${SHEBANG_FILES} | ${XARGS} ${SED} -i '' ${_SHEBANG_REINPLACE_ARGS}
Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -1447,6 +1447,11 @@
 
 DESTDIRNAME?=	DESTDIR
 
+# setup empty variables for USES targets
+.for target in fetch extract patch configure build install package stage
+_USES_${target}?=
+.endfor
+
 # Loading features
 .for f in ${USES}
 _f:=		${f:C/\:.*//}
@@ -5598,62 +5603,64 @@
 
 # Define the SEQ of actions to take when each target is ran, and which targets
 # it depends on before running its SEQ.
+#
+# Main target has a priority of 500, pre-target 30, post-target 700, target-depends 150.
 
-_SANITY_SEQ=	post-chroot pre-everything check-makefile \
-				show-warnings show-dev-warnings show-dev-errors \
-				check-categories check-makevars check-desktop-entries \
-				check-depends identify-install-conflicts check-deprecated \
-				check-vulnerable check-license check-config buildanyway-message \
-				options-message
+_SANITY_SEQ=	050:post-chroot 100:pre-everything 150:check-makefile \
+				200:show-warnings 210:show-dev-warnings 220:show-dev-errors \
+				250:check-categories 300:check-makevars 350:check-desktop-entries \
+				400:check-depends 450:identify-install-conflicts 500:check-deprecated \
+				550:check-vulnerable 600:check-license 650:check-config 700:buildanyway-message \
+				750:options-message
 
 _PKG_DEP=		check-sanity
-_PKG_SEQ=		pkg-depends
+_PKG_SEQ=		500:pkg-depends
 _FETCH_DEP=		pkg
-_FETCH_SEQ=		fetch-depends pre-fetch ${_OPTIONS_pre_fetch} pre-fetch-script \
-				do-fetch fetch-specials post-fetch ${_OPTIONS_post_fetch} post-fetch-script
+_FETCH_SEQ=		150:fetch-depends 300:pre-fetch ${_OPTIONS_pre_fetch:C/^/300://} 450:pre-fetch-script \
+				500:do-fetch 550:fetch-specials 700:post-fetch ${_OPTIONS_post_fetch:C/^/700:/} 850:post-fetch-script ${_USES_fetch}
 _EXTRACT_DEP=	fetch
-_EXTRACT_SEQ=	check-build-conflicts extract-message checksum extract-depends \
-				clean-wrkdir ${WRKDIR} pre-extract ${_OPTIONS_pre_extract} pre-extract-script do-extract \
-				post-extract ${_OPTIONS_post_extract} post-extract-script
+_EXTRACT_SEQ=	010:check-build-conflicts 050:extract-message 100:checksum 150:extract-depends \
+		190:clean-wrkdir 200:${WRKDIR} 300:pre-extract ${_OPTIONS_pre_extract} pre-extract-script do-extract \
+				post-extract ${_OPTIONS_post_extract} post-extract-script ${_USES_extract}
 _PATCH_DEP=		extract
-_PATCH_SEQ=		ask-license patch-message patch-depends pathfix dos2unix fix-shebang \
-				pre-patch ${_OPTIONS_pre_patch} \
-				pre-patch-script do-patch charsetfix-post-patch post-patch ${_OPTIONS_post_patch} post-patch-script
+_PATCH_SEQ=		050:ask-license 100:patch-message 150:patch-depends 200:dos2unix \
+				300:pre-patch ${_OPTIONS_pre_patch:C/^/300:/} \
+				450:pre-patch-script 500:do-patch 700:post-patch ${_OPTIONS_post_patch:C/^/700:/} 850:post-patch-script ${_USES_patch}
 _CONFIGURE_DEP=	patch
-_CONFIGURE_SEQ=	build-depends lib-depends configure-message \
-				pre-configure ${_OPTIONS_pre_configure} pre-configure-script \
-				run-autotools do-autoreconf patch-libtool run-autotools-fixup do-configure \
-				post-configure ${_OPTIONS_post_configure} post-configure-script
+_CONFIGURE_SEQ=	150:build-depends 151:lib-depends 200:configure-message \
+				300:pre-configure ${_OPTIONS_pre_configure:C/^/300:/} 450:pre-configure-script \
+				460:run-autotools 490:run-autotools-fixup 500:do-configure \
+				700:post-configure ${_OPTIONS_post_configure:C/^/700:} 850:post-configure-script ${_USES_configure}
 _BUILD_DEP=		configure
-_BUILD_SEQ=		build-message pre-build ${_OPTIONS_pre_build} pre-build-script do-build \
-				post-build ${_OPTIONS_post_build} post-build-script
+_BUILD_SEQ=		100:build-message 300:pre-build ${_OPTIONS_pre_build:C/^/300:/} 450:pre-build-script 500:do-build \
+				700:post-build ${_OPTIONS_post_build:C/^/700:/} 850:post-build-script ${_USES_build}
 
 _STAGE_DEP=		build
-_STAGE_SEQ=		stage-message stage-dir run-depends lib-depends apply-slist pre-install ${_OPTIONS_pre_install} ${_OPTIONS_pre_stage} generate-plist \
-				pre-su-install
-# ${POST_PLIST} must be after anything that modifies TMPPLIST
-_STAGE_SEQ+=	create-users-groups do-install \
-				kmod-post-install fix-perl-things \
-				webplugin-post-install post-install ${_OPTIONS_post_install} post-install-script \
-				move-uniquefiles patch-lafiles post-stage ${_OPTIONS_post_stage} compress-man \
-				install-rc-script install-ldconfig-file install-license \
-				install-desktop-entries add-plist-info add-plist-docs \
-				add-plist-examples add-plist-data add-plist-post \
-				move-uniquefiles-plist ${POST_PLIST}
+_STAGE_SEQ=		050:stage-message 100:stage-dir 150:run-depends 151:lib-depends 200:apply-slist 300:pre-install ${_OPTIONS_pre_install:C/^/300:/} ${_OPTIONS_pre_stage:C/^/300:/} 400:generate-plist \
+				450:pre-su-install
+# ${POST_PLIST} must be after anything that modifies TMPPLIST, so it gets priority 990.
+_STAGE_SEQ+=	475:create-users-groups 500:do-install \
+				550:kmod-post-install \
+				600:webplugin-post-install 700:post-install ${_OPTIONS_post_install:C/^/700:/} 750:post-install-script \
+				775:move-uniquefiles 800:post-stage ${_OPTIONS_post_stage:C/^/800:/} 850:compress-man \
+				860:install-rc-script 870:install-ldconfig-file 880:install-license \
+				890:install-desktop-entries 900:add-plist-info 910:add-plist-docs \
+				920:add-plist-examples 930:add-plist-data 940:add-plist-post \
+				950:move-uniquefiles-plist ${_USES_install} ${_USES_stage} ${POST_PLIST:C/^/990:/}
 .if defined(DEVELOPER)
-_STAGE_SEQ+=	stage-qa
+_STAGE_SEQ+=	995:stage-qa
 .endif
 _INSTALL_DEP=	stage
-_INSTALL_SEQ=	install-message run-depends lib-depends check-already-installed
-_INSTALL_SUSEQ=	fake-pkg security-check
+_INSTALL_SEQ=	100:install-message 150:run-depends 151:lib-depends 200:check-already-installed
+_INSTALL_SUSEQ=	300:fake-pkg 500:security-check
 
 _PACKAGE_DEP=	stage
-_PACKAGE_SEQ=	package-message pre-package ${_OPTIONS_pre_package} pre-package-script do-package ${_OPTIONS_post_package} post-package-script
+_PACKAGE_SEQ=	100:package-message 300:pre-package ${_OPTIONS_pre_package:C/^/300:/} 450:pre-package-script 500:do-package ${_OPTIONS_post_package:C/^/700:/} 850:post-package-script ${_USES_package}
 
 # Enforce order for -jN builds
 
 .for _t in ${_TARGETS_STAGES}
-.  for s in ${_${_t}_SEQ}
+.  for s in ${_${_t}_SEQ:O:C/^[0-9]+://}
 .    if target(${s})
 .      if ! ${NOTPHONY:M${s}}
 _PHONY_TARGETS+= ${s}
@@ -5661,7 +5668,7 @@
 _${_t}_REAL_SEQ+=	${s}
 .    endif
 .  endfor
-.  for s in ${_${_t}_SUSEQ}
+.  for s in ${_${_t}_SUSEQ:O:C/^[0-9]+://}
 .    if target(${s})
 .      if ! ${NOTPHONY:M${s}}
 _PHONY_TARGETS+= ${s}