diff --git a/contrib/kiss-chbuild b/contrib/kiss-chbuild
index 6508ed2..4001247 100755
--- a/contrib/kiss-chbuild
+++ b/contrib/kiss-chbuild
@@ -14,6 +14,24 @@ die() {
     exit 1
 }
 
+sh256() {
+    # There's no standard utility to generate sha256 checksums.
+    # This is a simple wrapper around sha256sum, sha256, shasum
+    # and openssl which will use whatever is available.
+    #
+    # All utilities must match 'sha256sum' output.
+    #
+    # Example: '<checksum>  <file>'
+    [ -e "$1" ] || return 0
+
+    hash=$(sha256sum "$1" ||
+           sha256 -r "$1" ||
+           openssl dgst -sha256 -r "$1" ||
+           shasum -a 256 "$1")
+
+    printf '%s  %s\n' "${hash%% *}" "$1"
+} 2>/dev/null
+
 cd "${cac_dir:=$KISS_ROOT${XDG_CACHE_HOME:-$HOME/.cache}/kiss}"
 url=https://github.com/kisslinux/repo/releases/download/1.10.0/
 
@@ -30,7 +48,7 @@ url=https://github.com/kisslinux/repo/releases/download/1.10.0/
 }
 
 log "Verifying checksums"
-sha256sum -c < kiss-chroot.tar.xz.sha256 ||
+sh256 kiss-chroot.tar.xz | diff - kiss-chroot.tar.xz.sha256 ||
     die "Checksum verification failed."
 
 [ -d kiss-chroot ] || {
diff --git a/contrib/kiss-chroot b/contrib/kiss-chroot
index 9584557..b1db149 100755
--- a/contrib/kiss-chroot
+++ b/contrib/kiss-chroot
@@ -24,6 +24,20 @@ clean() {
     }
 }
 
+mounted() {
+    # This is a pure shell mountpoint implementation. We're dealing
+    # with basic (and fixed/known) input so this doesn't need to
+    # handle more complex cases.
+    [ -e "$1" ]         || return 1
+    [ -e /proc/mounts ] || return 1
+
+    while read -r _ target _; do
+        [ "$target" = "$1" ] && return 0
+    done < /proc/mounts
+
+    return 1
+}
+
 [ -z "$1" ]        && die Need a path to the chroot
 [ -d "$1" ]        || die Given path does not exist
 [ "$(id -u)" = 0 ] || die Script needs to be run as root
@@ -31,11 +45,11 @@ clean() {
 trap 'clean "$1"' EXIT INT
 
 log Mounting /dev, /proc and /sys from host; {
-    mountpoint -q "$1/dev"  || mount -o bind /dev "$1/dev"
-    mountpoint -q "$1/proc" || mount -t proc proc "$1/proc"
-    mountpoint -q "$1/sys"  || mount -t sysfs sys "$1/sys"
+    mounted "$1/dev"  || mount -o bind /dev "$1/dev"
+    mounted "$1/proc" || mount -t proc proc "$1/proc"
+    mounted "$1/sys"  || mount -t sysfs sys "$1/sys"
 
-    mountpoint -q "$1/sys/firmware/efi/efivars" ||
+    mounted "$1/sys/firmware/efi/efivars" ||
         mount -t efivarfs efivarfs "$1/sys/firmware/efi/efivars" 2>/dev/null ||:
 }
 
diff --git a/contrib/kiss-export b/contrib/kiss-export
index 5cf71de..ddd174e 100755
--- a/contrib/kiss-export
+++ b/contrib/kiss-export
@@ -12,7 +12,7 @@
 read -r ver rel 2>/dev/null < "$KISS_ROOT/var/db/kiss/installed/$1/version"
 
 # Reset the argument list.
-pkg=$1
+pkg=$1 pwd=$PWD
 set --
 
 # Construct the argument list using each file.
@@ -20,12 +20,16 @@ while read -r file; do
     [ -d "$KISS_ROOT/$file" ] || set -- "$@" ".$file"
 done < "$KISS_ROOT/var/db/kiss/installed/$pkg/manifest"
 
-# Turn the list of files back into a package.
-tar cf - -C / -- "$@" | case ${KISS_COMPRESS:-gz} in
-    bz2) bzip2 -z ;;
-    gz)  gzip -6  ;;
-    xz)  xz -zT 0 ;;
-    zst) zstd -z  ;;
-esac > "$pkg#$ver-$rel.tar.${KISS_COMPRESS:-gz}"
+cd "$KISS_ROOT/"
 
-printf 'tarball created in %s\n' "$PWD/$pkg#$ver-$rel.tar.${KISS_COMPRESS:-gz}"
+# Turn the list of files back into a package.
+tar cf - "$@" | case ${KISS_COMPRESS:-gz} in
+    bz2)  bzip2 -z ;;
+    gz)   gzip -6  ;;
+    lzma) lzma -z  ;;
+    lz)   lzip -z  ;;
+    xz)   xz -zT 0 ;;
+    zst)  zstd -z  ;;
+esac > "$pwd/$pkg#$ver-$rel.tar.${KISS_COMPRESS:-gz}"
+
+printf 'tarball created in %s\n' "$pwd/$pkg#$ver-$rel.tar.${KISS_COMPRESS:-gz}"