[...]

do so (now or later) by using -b with the checkout command again. Example:
  git checkout -b new_branch_name
HEAD is now at f7d2631... - restore SHM and monitor functionality - add 4 and 5 fingers events - rel 2
fatal: HEAD does not point to a branch
Available branches: master
--2015-07-22 08:34:45--  http://distfiles.pld-linux.org/distfiles/by-md5/8/e/8ed68e8cc674dd61adb280704764aafb/xf86-input-synaptics-1.8.2.tar.bz2
Resolving distfiles.pld-linux.org (distfiles.pld-linux.org)... 193.239.45.41
Connecting to distfiles.pld-linux.org (distfiles.pld-linux.org)|193.239.45.41|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 484261 (473K) [application/x-bzip2]
Saving to: 'xf86-input-synaptics-1.8.2.tar.bz2'
     0K .......... .......... .......... .......... .......... 10%  782K 1s
    50K .......... .......... .......... .......... .......... 21% 1.49M 0s
   100K .......... .......... .......... .......... .......... 31% 1.51M 0s
   150K .......... .......... .......... .......... .......... 42% 1.60M 0s
   200K .......... .......... .......... .......... .......... 52% 11.5M 0s
   250K .......... .......... .......... .......... .......... 63% 1.72M 0s
   300K .......... .......... .......... .......... .......... 74% 11.6M 0s
   350K .......... .......... .......... .......... .......... 84% 10.8M 0s
   400K .......... .......... .......... .......... .......... 95% 1.95M 0s
   450K .......... .......... ..                              100% 11.2M=0.2s
2015-07-22 08:34:45 (2.03 MB/s) - 'xf86-input-synaptics-1.8.2.tar.bz2' saved [484261/484261]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/xorg-driver-input-synaptics-1.8.2-2.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at f7d2631... - restore SHM and monitor functionality - add 4 and 5 fingers events - rel 2
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/xorg-driver-input-synaptics-1.8.2-2
On detached HEAD. Use -r BRANCHNAME to override
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean): env -i TMP=/home/users/builder/tmp HOME=/home/users/builder PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.22322
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf xf86-input-synaptics-1.8.2
Begin-PLD-Builder-Info
Build-Time: user:3.04s sys:1.69s real:10.82s (faults io:0 non-io:244365)
Files queued for ftp:
    497991 xorg-driver-input-synaptics-1.8.2-2.src.rpm
       205 xorg-driver-input-synaptics-1.8.2-2.src.rpm.uploadinfo
End-PLD-Builder-Info