[...]

building SRPM using: cd rpm/packages; nice -n 0 ./builder -nu -nm --nodeps --http --define '_tld_builder 1' -bs  -r HEAD   mdadm.spec 2>&1
builder: SMP make flags are set to -j2
Cloning into 'mdadm'...
Already up to date.
warning: line 39: It's not recommended to have unversioned Obsoletes: Obsoletes:	mdctl
No conditional flags passed
from available:
--with   :	 dietlibc initrd
--without:	 tests
Available branches: master
--2021-05-01 14:17:01--  http://df.tld-linux.org/by-md5/5/1/51bf3651bd73a06c413a2f964f299598/mdadm-4.1.tar.xz
Resolving df.tld-linux.org... 51.254.4.224
Connecting to df.tld-linux.org|51.254.4.224|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 440756 (430K) [application/x-xz]
Saving to: 'mdadm-4.1.tar.xz'
     0K .......... .......... .......... .......... .......... 11%  148M 0s
    50K .......... .......... .......... .......... .......... 23%  152M 0s
   100K .......... .......... .......... .......... .......... 34%  149M 0s
   150K .......... .......... .......... .......... .......... 46%  241M 0s
   200K .......... .......... .......... .......... .......... 58%  209M 0s
   250K .......... .......... .......... .......... .......... 69%  219M 0s
   300K .......... .......... .......... .......... .......... 81%  221M 0s
   350K .......... .......... .......... .......... .......... 92%  254M 0s
   400K .......... .......... ..........                      100%  198M=0.002s
2021-05-01 14:17:01 (191 MB/s) - 'mdadm-4.1.tar.xz' saved [440756/440756]
./builder[2756]: ulimit: exceeds allowable limit
warning: line 39: It's not recommended to have unversioned Obsoletes: Obsoletes:	mdctl
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/mdadm-4.1-1.src.rpm
real 0.08
user 0.06
sys 0.01
exit status 0
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:0.59s sys:0.51s real:1.28s (faults io:0 non-io:94551)
Files queued for ftp:
    680090 mdadm-4.1-1.src.rpm
End-TLD-Builder-Info