I created a basic raw Haiku disk image using the guidance of this page:
https://www.haiku-os.org/guides/building/compiling-x86_64
./configure --build-cross-tools x86_64 ../buildtools
jam -q -j2 haiku-image
MkDir1 /home/hkkerneldev/haiku0515/haiku/generated/objects/haiku/x86_64/packaging/packages_build/regular/hpkg_-haiku_loader.hpkg
DetermineHaikuRevision1 /home/hkkerneldev/haiku0515/haiku/generated/build/haiku-revision
fatal: No names found, cannot describe anything.
Error: you are using a Haiku clone without tags, please set
the revision tag to use (e.g. HAIKU_REVISION=hrev43210)
/home/hkkerneldev/haiku0515/haiku/build/scripts/determine_haiku_revision /home/hkkerneldev/haiku0515/haiku /home/hkkerneldev/haiku0515/haiku/generated/build/haiku-revision
...failed DetermineHaikuRevision1 /home/hkkerneldev/haiku0515/haiku/generated/build/haiku-revision ...
100%[======================================>] 1,015,641 25.7KB/s 53s
2016-05-15 17:19:17 (18.6 KB/s) - “/home/hkkerneldev/haiku0515/haiku/generated/download/wget-1.17.1-1-x86_64.hpkg” [1015641/1015641])
BUILD FAILURE:
...failed updating 1 target(s)...
...skipped 6 target(s)...
...updated 216 target(s)...
hkkerneldev@ubuntu:~/haiku0515/haiku/generated$
I do not understand the tips given,how do I solve this problem ?