[Libguestfs] Building virt-v2v - Error: guestfs_config.cmi: is not a compiled interface for this version of OCaml

I did not touch virt-v2v for a while, and I cannot build it now. There are not instructions in the README on under docs, so I tried the common stuff: $ ./autogen.sh ... Next you should type 'make' to build the package, ... $ make make all-recursive make[1]: Entering directory '/home/nsoffer/src/virt-v2v' Making all in common/mlstdutils make[2]: Entering directory '/home/nsoffer/src/virt-v2v/common/mlstdutils' OCAMLOPT guestfs_config.cmx File "guestfs_config.ml", line 1: Error: guestfs_config.cmi is not a compiled interface for this version of OCaml. It seems to be for an older version of OCaml. make[2]: *** [Makefile:2321: guestfs_config.cmx] Error 2 make[2]: Leaving directory '/home/nsoffer/src/virt-v2v/common/mlstdutils' make[1]: *** [Makefile:1842: all-recursive] Error 1 make[1]: Leaving directory '/home/nsoffer/src/virt-v2v' make: *** [Makefile:1760: all] Error 2 I'm using Fedora 31. Nir