diff --git a/build.sh b/build.sh
index f43565e..38e6444 100755
--- a/build.sh
+++ b/build.sh
@@ -33,7 +33,7 @@ case ${1} in
 	if [ -z "${ARG_RESTART_AT}" ]; then
 		ARG_RESTART_AT=ALL;
 	fi; shift; ;;
-init|host_toolchain|native_toolchain|runtime|lib_packages|leaf_packages|devroot|world)
+host_toolchain|native_toolchain|runtime|lib_packages|leaf_packages|devroot|world)
 	BUILD_TARGETS_META="${BUILD_TARGETS_META:+${BUILD_TARGETS_META} }${1}"; ;;
 *=*)	set_var_unsafe "${1%%=*}" "${1#*=}"; ;;
 *)	exec cat etc/build.usage; ;;
@@ -43,6 +43,7 @@ source_vars; clear_env;
 if [ -z "${BUILD_TARGETS_META}" ]; then
 	BUILD_TARGETS_META=world;
 fi;
+BUILD_TARGETS_META="invariants ${BUILD_TARGETS_META}";
 
 #
 # Check whether the pathnames in build.vars contain non-empty valid values.
@@ -64,7 +65,8 @@ for BUILD_TARGET_LC in $(subst_tgts ${BUILD_TARGETS_META}); do
 	BUILD_TARGET=$(echo ${BUILD_TARGET_LC} | tr a-z A-Z);
 	for BUILD_PACKAGE_LC in $(get_var_unsafe ${BUILD_TARGET}_PACKAGES); do
 		BUILD_PACKAGE=$(echo ${BUILD_PACKAGE_LC} | tr a-z A-Z);
-		if [ -n "${ARG_RESTART}" ]; then
+		if [ "${BUILD_TARGET}" != "INVARIANTS" ]\
+		&& [ -n "${ARG_RESTART}" ]; then
 			if [ "${ARG_RESTART}" != "ALL" ] &&\
 			! match_list ${ARG_RESTART} , ${BUILD_PACKAGE_LC}; then
 				log_msg vnfo "Skipped \`${BUILD_PACKAGE_LC}' (-r specified.)";
@@ -86,7 +88,8 @@ for BUILD_TARGET_LC in $(subst_tgts ${BUILD_TARGETS_META}); do
 			fi;
 			continue;
 		fi;
-		if [ -z "${ARG_RESTART}" ]\
+		if [ "${BUILD_TARGET}" != "INVARIANTS" ]\
+		&& [ -z "${ARG_RESTART}" ]\
 		&& is_build_script_done finish "${BUILD_PACKAGE_LC}"; then
 			log_msg vnfo "Skipped \`${BUILD_PACKAGE_LC}' (already built.)";
 			: $((BUILD_NSKIP+=1)); BUILD_SCRIPT_RC=0; continue;
diff --git a/etc/build.usage b/etc/build.usage
index ca85402..a2bc2b1 100644
--- a/etc/build.usage
+++ b/etc/build.usage
@@ -22,7 +22,7 @@ usage: ./build.sh [-x] [-a nt32|nt64] [-b debug|release] [-c] [-C] [-h]
                                 with GPG; the default compression is xz.
         -v                      Be verbose; this currently only affects secure_{cd,rm}() and insecure_mkdir().
         <target>[ ...]          One of:
-                                init, host_toolchain, native_toolchain, runtime, lib_packages,
+                                host_toolchain, native_toolchain, runtime, lib_packages,
                                 leaf_packages, world, or devroot.
 
         ${HOME}/midipix_build.vars, ../midipix_build.vars, and build.vars are sourced
diff --git a/vars/build.vars b/vars/build.vars
index 87b08ae..6df53ce 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -74,9 +74,9 @@ fi;
 export PATH="${PREFIX}/bin${PATH:+:${PATH}}";
 
 #
-# Build target init
+# Build target invariants
 #
-INIT_PACKAGES="chainport";
+INVARIANTS_PACKAGES="chainport";
 : ${PKG_CHAINPORT_URL:=${GITROOT}/ports/chainport};
 : ${PKG_CHAINPORT_URL_TYPE:=git};
 : ${PKG_CHAINPORT_BUILD_DIR:=chainport};
@@ -719,8 +719,8 @@ LEAF_PACKAGES_PREFIX="${PREFIX_NATIVE}";
 #
 # Build meta-targets
 #
-DEVROOT_PACKAGES="init host_toolchain native_toolchain runtime";
-WORLD_PACKAGES="init host_toolchain native_toolchain runtime lib_packages leaf_packages";
-ALL_TARGETS="init host_toolchain native_toolchain runtime lib_packages leaf_packages devroot world";
+DEVROOT_PACKAGES="host_toolchain native_toolchain runtime";
+WORLD_PACKAGES="host_toolchain native_toolchain runtime lib_packages leaf_packages";
+ALL_TARGETS="host_toolchain native_toolchain runtime lib_packages leaf_packages devroot world";
 
 # vim:filetype=sh textwidth=0