New comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/issues/40980#issuecomment-1351824159

Comment:
It is simple to modify xbps-src to use qemu, just an example:
```patch
--- a/common/xbps-src/shutils/chroot.sh
+++ b/common/xbps-src/shutils/chroot.sh
@@ -160,7 +160,7 @@ chroot_handler() {
 
     if [ "$action" = "chroot" ]; then
         $XBPS_COMMONDIR/chroot-style/${XBPS_CHROOT_CMD:=uunshare}.sh \
-            $XBPS_MASTERDIR $XBPS_DISTDIR "$XBPS_HOSTDIR" "$XBPS_CHROOT_CMD_ARGS" /bin/xbps-shell
+            $XBPS_MASTERDIR $XBPS_DISTDIR "$XBPS_HOSTDIR" "$XBPS_CHROOT_CMD_ARGS" /usr/bin/qemu-aarch64-static /bin/bash /bin/xbps-shell
         rv=$?
     else
         env -i -- PATH="/usr/bin:$PATH" SHELL=/bin/sh \
@@ -178,7 +178,7 @@ chroot_handler() {
             ${XBPS_ALT_REPOSITORY:+XBPS_ALT_REPOSITORY=$XBPS_ALT_REPOSITORY} \
             $XBPS_COMMONDIR/chroot-style/${XBPS_CHROOT_CMD:=uunshare}.sh \
             $XBPS_MASTERDIR $XBPS_DISTDIR "$XBPS_HOSTDIR" "$XBPS_CHROOT_CMD_ARGS" \
-            /void-packages/xbps-src $XBPS_OPTIONS $action $pkg
+            /usr/bin/qemu-aarch64-static /bin/bash /void-packages/xbps-src $XBPS_OPTIONS $action $pkg
         rv=$?
     fi
 

```
```sh
echo XBPS_CHROOT_CMD=bwrap >> etc/conf
./xbps-src binary-bootstrap -m maarch aarch64-musl
cp /usr/bin/qemu-aarch64-static maarch/usr/bin/
./xbps-src -m maarch pkg libtool
./xbps-src -m maarch pkg ntl
```
This assumes bubblewrap, qemu-user-static and binfmt are available on the host. It would have to be improved if it was meant to be merged to void-packages and it's very slow.