[...]

fatal: HEAD does not point to a branch
Available branches: master
Searching for tag auto/ti/glfw-3.2.1-1...
Searching for tag auto/ti/glfw-3_2_1-1...
--2019-08-17 23:17:25--  http://distfiles.pld-linux.org/by-md5/6/6/66e947d7fdba87d2d570d5afe1428835/glfw-3.2.1.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: 654840 (639K) [application/x-bzip2]
Saving to: 'glfw-3.2.1.tar.bz2'
     0K .......... .......... .......... .......... ..........  7%  484K 1s
    50K .......... .......... .......... .......... .......... 15% 1.19M 1s
   100K .......... .......... .......... .......... .......... 23%  127M 0s
   150K .......... .......... .......... .......... .......... 31% 39.1M 0s
   200K .......... .......... .......... .......... .......... 39% 1.20M 0s
   250K .......... .......... .......... .......... .......... 46% 3.59M 0s
   300K .......... .......... .......... .......... .......... 54%  244M 0s
   350K .......... .......... .......... .......... .......... 62%  223M 0s
   400K .......... .......... .......... .......... .......... 70% 1.46M 0s
   450K .......... .......... .......... .......... .......... 78%  237M 0s
   500K .......... .......... .......... .......... .......... 86%  227M 0s
   550K .......... .......... .......... .......... .......... 93% 5.68M 0s
   600K .......... .......... .......... .........            100%  235M=0.2s
2019-08-17 23:17:26 (2.57 MB/s) - 'glfw-3.2.1.tar.bz2' saved [654840/654840]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/glfw-3.2.1-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
HEAD is now at 9b17509 - updated to 3.2.1
fatal: HEAD does not point to a branch
Writing git revision for tag auto/ti/glfw-3.2.1-1
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.60801
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf glfw-3.2.1
Begin-TLD-Builder-Info
Build-Time: user:1.19s sys:1.10s real:6.46s (faults io:0 non-io:90351)
Files queued for ftp:
    659046 glfw-3.2.1-1.src.rpm
       182 glfw-3.2.1-1.src.rpm.uploadinfo
End-TLD-Builder-Info