diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 73d3ffdb..8aeeb41d 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -9,60 +9,19 @@
 #
 set -ex
 
-substr() { [ -z "${2##*$1*}" ]; }
-
-#apt-get install qemu qemu-user-static qemu-system-arm debootstrap fakeroot proot
-mychroot_nocwd() {
-        # LC_ALL + LANGUAGE set to avoid lots of print errors due to locale not being set inside container
-        # PATH is needed to be able to reach binaries like ldconfig without logging in to root, which adds the paths to PATH.
-        # PROOT_NO_SECCOMP is required due to proot bug #106
-        LC_ALL=C LANGUAGE=C PATH="$PATH:/usr/sbin:/sbin" PROOT_NO_SECCOMP=1 proot -r "$ROOTFS" -w / -b /proc --root-id -q qemu-arm-static "$@"
-}
-
-mychroot() {
-        mychroot_nocwd -w / "$@"
-}
-
-if [ -z "${INSIDE_CHROOT}" ]; then
-
-        # Only use ARM chroot if host is not ARM and the target is ARM:
-        if ! $(substr "arm" "$(uname -m)") && [ "x${INSTR}" = "x--with-neon" -o "x${INSTR}" = "x--with-neon-vfpv4" ]; then
-
-                OSMOTRX_DIR="$PWD" # we assume we are called as contrib/jenkins.sh
-                ROOTFS_PREFIX="${ROOTFS_PREFIX:-$HOME}"
-                ROOTFS="${ROOTFS_PREFIX}/qemu-img"
-                mkdir -p "${ROOTFS_PREFIX}"
-
-                # Prepare chroot:
-                if [ ! -d "$ROOTFS" ]; then
-                        mkdir -p "$ROOTFS"
-                        if [ "x${USE_DEBOOTSTRAP}" = "x1" ]; then
-                                fakeroot qemu-debootstrap --foreign --include="linux-image-armmp-lpae" --arch=armhf stretch "$ROOTFS" http://ftp.de.debian.org/debian/
-                                # Hack to avoid debootstrap trying to mount /proc, as it will fail with "no permissions" and anyway proot takes care of it:
-                                sed -i "s/setup_proc//g" "$ROOTFS/debootstrap/suite-script"
-                                mychroot /debootstrap/debootstrap --second-stage --verbose http://ftp.de.debian.org/debian/
-                        else
-                                YESTERDAY=$(python -c 'import datetime ; print((datetime.datetime.now() - datetime.timedelta(days=1)).strftime("%Y%m%d"))')
-                                wget -nc -q "https://uk.images.linuxcontainers.org/images/debian/stretch/armhf/default/${YESTERDAY}_22:42/rootfs.tar.xz"
-                                tar -xf rootfs.tar.xz -C "$ROOTFS/" || true
-                                echo "nameserver 8.8.8.8" > "$ROOTFS/etc/resolv.conf"
-                        fi
-                        mychroot -b /dev apt-get update
-                        mychroot apt-get -y install build-essential dh-autoreconf pkg-config libuhd-dev libusb-1.0-0-dev libusb-dev git libtalloc-dev libgnutls28-dev stow
-                fi
-                # Run jenkins.sh inside the chroot:
-                INSIDE_CHROOT=1 mychroot_nocwd \
-                 -w /osmo-trx \
-                 -b "$OSMOTRX_DIR:/osmo-trx" \
-                 -b "$(which osmo-clean-workspace.sh):/usr/bin/osmo-clean-workspace.sh" \
-                 -b "$(which osmo-build-dep.sh):/usr/bin/osmo-build-dep.sh" \
-                 -b "$(which osmo-deps.sh):/usr/bin/osmo-deps.sh" \
-                  ./contrib/jenkins.sh
-                exit 0
-        fi
-fi
-
-set -ex
+case "$INSTR" in
+	"--with-neon"*)
+		case "$(arch)" in
+			arm*)
+				;;
+			*)
+				set +x
+				echo "ERROR: trying to build with INSTR=$INSTR but not running on a 32-bit arm machine! (arch=$(arch))"
+				exit 1
+				;;
+		esac
+		;;
+esac
 
 if ! [ -x "$(command -v osmo-build-dep.sh)" ]; then
 	echo "Error: We need to have scripts/osmo-deps.sh from http://git.osmocom.org/osmo-ci/ in PATH !"