[Libguestfs] Unable to build appliance

Hello-- I've been trying to build libguestfs 1.2.14 with the appliance enabled on an older type of system at my company. Getting all the required dependencies installed has been an arduous process, but I've finally hit an obstacle I don't know how to get around. The final output of "make": + febootstrap-run initramfs -- /sbin/depmod -a ABOUT-NLS BUGS COPYING COPYING.LIB ChangeLog GNUmakefile HACKING Makefile Makefile.am Makefile.in README TODO aclocal.m4 appliance bindtests build-aux capitests config.h config.h.in config.log config.status configure configure.ac contrib daemon examples fish fuse gnulib haskell html images initramfs inspector java libguestfs.pc libguestfs.pc.in libtool m4 maint.mk make-recipes.sh ocaml perl po python recipes regressions ruby src stamp-h1 subdir-rules.mktest-tool tools chroot: cannot run command `/sbin/depmod': No such file or directory make[2]: *** [../initramfs/fakeroot.log] Error 1 make[2]: Leaving directory `/tmp/libguestfs-1.2.14/appliance' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/tmp/libguestfs-1.2.14' make: *** [all] Error 2 /sbin/depmod does indeed exist. I suppose that it doesn't exist inside the chroot febootstrap-run is running in, but I couldn't imagine why not. Can anyone offer any suggestions? Thanks in advance for any help.