Hi, commit b536c61a6df3 ("m4: Remove test for OCaml Bytes module", 2021-11-09) removed AM_CONDITIONAL([HAVE_BYTES_COMPAT_ML ... from "m4/guestfs-ocaml.m4". However, in the common submodule, "mlstdutils/Makefile.am" still contains lines such as: if HAVE_BYTES_COMPAT_ML This causes autoreconf in libguestfs to fail with: common/mlstdutils/Makefile.am:30: error: HAVE_BYTES_COMPAT_ML does not appear in AM_CONDITIONAL My libguestfs checkout is current master (commit 4fe8df48a723), with the matching common submodule checkout (62ccce447228). Substituting a constant for HAVE_BYTES_COMPAT_ML in the "common" submodule is not obviously a solution, as guestfs-tools still has AM_CONDITIONAL([HAVE_BYTES_COMPAT_ML ..., in "configure.ac" (at commit 7fdf82407d36). For now, so that I can progress with something else, I guess I'll try checking out libguestfs at an earlier commit than b536c61a6df3. Thanks, Laszlo