[...]

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.
If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:
  git checkout -b new_branch_name
HEAD is now at 2c6f512... - rel 10; gd rebuild
error: HEAD does not point to a branch
fatal: @{u} - not something we can merge
No conditional flags passed
from available:
--with   :	 bootstrap
--without:	 xindy
Available branches: AC-branch RA-branch TEXLIVE_20080816 master
Searching for tag auto/ti/texlive-20080816-20...
Tag auto/ti/texlive-20080816-20 already exists
exit status 2304
error: No files produced.
On detached HEAD. Use -r BRANCHNAME to override
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
error: Fetching /%{_Rsourcedir}/waitVariableX.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TeXCatalogue.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLWinGoo.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLUtils.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLTREE.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLPostActions.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLPaper.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLPSRC.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLPOBJ.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLPDB.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLMedia.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/TLConfig.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/Splashscreen.pm failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/foiltex.zip failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/texlive-fonts-larm.tar.bz2 failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/floatflt.zip failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/texlive-20080822-texmf.tar.lzma failed: Unknown or unexpected error
error: Fetching /%{_Rsourcedir}/texlive-20080816-source.tar.lzma failed: Unknown or unexpected error
Begin-PLD-Builder-Info
Build-Time: user:3.90s sys:0.76s real:6.10s (faults io:15 non-io:78630)
End-PLD-Builder-Info