diff --git a/include/option.sh b/include/option.sh
index 8367d447..7c434444 100755
--- a/include/option.sh
+++ b/include/option.sh
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-3.0-only
 # SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
 # SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
-# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
+# SPDX-FileCopyrightText: 2020-2023 Leah Rowe <leah@libreboot.org>
 
 vendir="vendorfiles"
 appdir="${vendir}/app"
@@ -9,6 +9,9 @@ cbdir="src/coreboot/default"
 cbcfgsdir="config/coreboot"
 ifdtool="cbutils/default/ifdtool"
 cbfstool="cbutils/default/cbfstool"
+grubcfgsdir="config/grub"
+layoutdir="/boot/grub/layouts"
+. "${grubcfgsdir}/modules.list"
 
 eval "$(setvars "" CONFIG_BOARD_DELL_E6400 CONFIG_HAVE_MRC CONFIG_HAVE_ME_BIN \
     CONFIG_ME_BIN_PATH CONFIG_KBC1126_FIRMWARE CONFIG_KBC1126_FW1 \
diff --git a/script/build/grub b/script/build/grub
deleted file mode 100755
index 3313684d..00000000
--- a/script/build/grub
+++ /dev/null
@@ -1,81 +0,0 @@
-#!/usr/bin/env sh
-# SPDX-License-Identifier: GPL-3.0-or-later
-# SPDX-FileCopyrightText: 2014,2015,2020,2021,2023 Leah Rowe <leah@libreboot.org>
-
-set -u -e
-
-. "include/err.sh"
-
-elfdir="elf/grub"
-grubcfgsdir="config/grub"
-layoutdir="/boot/grub/layouts"
-
-. "${grubcfgsdir}/modules.list"
-
-main()
-{
-	handle_dependencies
-	build_keymap_configs
-	build_grub_payload
-	printf "GRUB files now available under directory: %s\n" "${elfdir}"
-}
-
-handle_dependencies()
-{
-	[ -d "src/grub" ] || x_ ./update trees -f grub
-	[ -f "src/grub/grub-mkstandalone" ] || build_grub_utils
-	x_ mkdir -p "${elfdir}"
-	rm -f "${elfdir}/"* || err "!rm elf, handle_, ${elfdir}/"
-}
-
-build_grub_utils()
-{
-	(
-	x_ cd "src/grub"
-	[ ! -d Makefile ] || x_ make distclean
-	x_ ./bootstrap --gnulib-srcdir=gnulib/ --no-git
-	x_ ./autogen.sh
-	x_ ./configure --with-platform=coreboot
-	make -j$(nproc) FS_PAYLOAD_MODULES="" || err "!mk grub utils"
-	) || err "grub build error"
-}
-
-build_keymap_configs()
-{
-	for keylayoutfile in "${grubcfgsdir}/keymap/"*.gkb; do
-		[ -f "${keylayoutfile}" ] || continue
-		keymap="${keylayoutfile##"${grubcfgsdir}/keymap/"}"
-		keymap="${keymap%.gkb}"
-		printf "keymap %s\n" "${keymap}" > \
-		    "${elfdir}/keymap_${keymap}.cfg" || err "!insert keymap"
-	done
-}
-
-build_grub_payload()
-{
-	./src/grub/grub-mkstandalone \
-	    --grub-mkimage="src/grub/grub-mkimage" \
-	    -O i386-coreboot \
-	    -o "${elfdir}/grub.elf" \
-	    -d "src/grub/grub-core/" \
-	    --fonts= --themes= --locales=  \
-	    --modules="${grub_modules}" \
-	    --install-modules="${grub_install_modules}" \
-	    "${layoutdir}/colemak.gkb=${grubcfgsdir}/keymap/colemak.gkb" \
-	    "${layoutdir}/deqwertz.gkb=${grubcfgsdir}/keymap/deqwertz.gkb" \
-	    "${layoutdir}/esqwerty.gkb=${grubcfgsdir}/keymap/esqwerty.gkb" \
-	    "${layoutdir}/frazerty.gkb=${grubcfgsdir}/keymap/frazerty.gkb" \
-	    "${layoutdir}/frdvbepo.gkb=${grubcfgsdir}/keymap/frdvbepo.gkb" \
-	    "${layoutdir}/itqwerty.gkb=${grubcfgsdir}/keymap/itqwerty.gkb" \
-	    "${layoutdir}/svenska.gkb=${grubcfgsdir}/keymap/svenska.gkb" \
-	    "${layoutdir}/trqwerty.gkb=${grubcfgsdir}/keymap/trqwerty.gkb" \
-	    "${layoutdir}/ukdvorak.gkb=${grubcfgsdir}/keymap/ukdvorak.gkb" \
-	    "${layoutdir}/ukqwerty.gkb=${grubcfgsdir}/keymap/ukqwerty.gkb" \
-	    "${layoutdir}/usdvorak.gkb=${grubcfgsdir}/keymap/usdvorak.gkb" \
-	    "${layoutdir}/usqwerty.gkb=${grubcfgsdir}/keymap/usqwerty.gkb" \
-	    "/boot/grub/grub.cfg=${grubcfgsdir}/config/grub_memdisk.cfg" \
-	    "/boot/grub/grub_default.cfg=${grubcfgsdir}/config/grub.cfg" || \
-	    err "build_grub_elf: cannot build grub payload (grub-mkstandalone)"
-}
-
-main $@
diff --git a/script/build/roms b/script/build/roms
index 95b697ec..35373594 100755
--- a/script/build/roms
+++ b/script/build/roms
@@ -165,7 +165,49 @@ build_dependency_grub()
 		    rebuild_grub="y"
 	done
 	[ -n "${_keyboard}" ] && keymaps="${kmapdir}/${_keyboard}.gkb"
-	[ "${rebuild_grub}" = "y" ] && x_ ./build grub; return 0
+	[ "$rebuild_grub" = "y" ] || return 0
+	x_ ./update trees -b grub
+	remkdir elf/grub
+	build_keymap_configs
+	build_grub_payload
+}
+
+build_keymap_configs()
+{
+	for keylayoutfile in "${grubcfgsdir}/keymap/"*.gkb; do
+		[ -f "${keylayoutfile}" ] || continue
+		keymap="${keylayoutfile##"${grubcfgsdir}/keymap/"}"
+		keymap="${keymap%.gkb}"
+		printf "keymap %s\n" "${keymap}" > \
+		    "elf/grub/keymap_${keymap}.cfg" || err "!insert keymap"
+	done
+}
+
+build_grub_payload()
+{
+	./src/grub/grub-mkstandalone \
+	    --grub-mkimage="src/grub/grub-mkimage" \
+	    -O i386-coreboot \
+	    -o "elf/grub/grub.elf" \
+	    -d "src/grub/grub-core/" \
+	    --fonts= --themes= --locales=  \
+	    --modules="${grub_modules}" \
+	    --install-modules="${grub_install_modules}" \
+	    "${layoutdir}/colemak.gkb=${grubcfgsdir}/keymap/colemak.gkb" \
+	    "${layoutdir}/deqwertz.gkb=${grubcfgsdir}/keymap/deqwertz.gkb" \
+	    "${layoutdir}/esqwerty.gkb=${grubcfgsdir}/keymap/esqwerty.gkb" \
+	    "${layoutdir}/frazerty.gkb=${grubcfgsdir}/keymap/frazerty.gkb" \
+	    "${layoutdir}/frdvbepo.gkb=${grubcfgsdir}/keymap/frdvbepo.gkb" \
+	    "${layoutdir}/itqwerty.gkb=${grubcfgsdir}/keymap/itqwerty.gkb" \
+	    "${layoutdir}/svenska.gkb=${grubcfgsdir}/keymap/svenska.gkb" \
+	    "${layoutdir}/trqwerty.gkb=${grubcfgsdir}/keymap/trqwerty.gkb" \
+	    "${layoutdir}/ukdvorak.gkb=${grubcfgsdir}/keymap/ukdvorak.gkb" \
+	    "${layoutdir}/ukqwerty.gkb=${grubcfgsdir}/keymap/ukqwerty.gkb" \
+	    "${layoutdir}/usdvorak.gkb=${grubcfgsdir}/keymap/usdvorak.gkb" \
+	    "${layoutdir}/usqwerty.gkb=${grubcfgsdir}/keymap/usqwerty.gkb" \
+	    "/boot/grub/grub.cfg=${grubcfgsdir}/config/grub_memdisk.cfg" \
+	    "/boot/grub/grub_default.cfg=${grubcfgsdir}/config/grub.cfg" || \
+	    err "build_grub_elf: cannot build grub payload (grub-mkstandalone)"
 }
 
 build_dependency_uboot()
diff --git a/script/update/trees b/script/update/trees
index 556181ed..9d1e89ff 100755
--- a/script/update/trees
+++ b/script/update/trees
@@ -33,6 +33,7 @@ main()
 	done
 	[ -z "$_f" ] && err "missing flag (-m/-u/-b/-c/-x/-f/-s/-l/-n)"
 	[ -z "$project" ] && err "project name not specified"
+	elfdir="elf/${project}"
 
 	check_project
 
@@ -63,7 +64,6 @@ build_projects()
 
 build_targets()
 {
-	elfdir="elf/${project}"
 	[ "$elfdir" = "elf/coreboot" ] && \
 		elfdir="elf/coreboot_nopayload_DO_NOT_FLASH"
 
@@ -204,17 +204,39 @@ handle_makefile()
 
 run_make_command()
 {
-	[ -f "${codedir}/Makefile" ] || [ -f "${codedir}/makefile" ] || \
-	    [ -f "${codedir}/GNUmakefile" ] || return 1
+	[ -z "$mode" ] && check_autoconf "$codedir"
+	check_makefile "$codedir" || return 1
+
 	[ "$project" = "coreboot" ] && [ -z "$mode" ] && \
 		x_ printf "%s\n" "${version%%-*}" \
 		    > "${codedir}/.coreboot-version"
 
-	x_ make $mode -j$(nproc) -C "$codedir"
+	make $mode -j$(nproc) FS_PAYLOAD_MODULES="" -C "$codedir" || \
+	    err "run_make $codedir: !make $mode"
+
 	[ "$mode" != "clean" ] && return 0
 	make -C "$codedir" distclean 2>/dev/null || :
 }
 
+check_autoconf()
+{
+	(
+	_cfgopt=""
+	cd "${codedir}" || err "!cd $codedir"
+	[ "$project" = "grub" ] && _cfgopt="--gnulib-srcdir=gnulib/ --no-git"
+	[ -f "bootstrap" ] && x_ ./bootstrap $_cfgopt
+	[ -f "autogen.sh" ] && x_ ./autogen.sh
+	[ "$project" = "grub" ] && _cfgopt="--with-platform=coreboot"
+	[ -f "configure" ] && x_ ./configure $_cfgopt; return 0
+	) || err "can't bootstrap project: $codedir"
+}
+
+check_makefile()
+{
+	[ -f "${1}/Makefile" ] || [ -f "${1}/makefile" ] || \
+	    [ -f "${1}/GNUmakefile" ] || return 1; return 0
+}
+
 copy_elf()
 {
 	while read -r f; do