[...]

builder: SMP make flags are set to -j2
Already up to date.
warning: Macro expanded in comment on line 17: %{name}-%{version}.tar.gz
warning: line 50: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1
warning: line 73: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1-devel
warning: line 122: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt-proc
No conditional flags passed
from available:
--with   :	 tests
--without:	 python2 python3 static_libs
Available branches: AC-branch RA-branch master
libxslt-1.1.39.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: unlimited exceeds allowable coredump(blocks) limit
warning: Macro expanded in comment on line 17: %{name}-%{version}.tar.gz
warning: line 50: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1
warning: line 73: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1-devel
warning: line 122: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt-proc
Building target platforms: x86_64-linux
Building for target x86_64-linux
Wrote: /home/users/builder/rpm/SRPMS/libxslt-1.1.39-1.src.rpm
RPM build warnings:
    Macro expanded in comment on line 17: %{name}-%{version}.tar.gz
    line 50: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1
    line 73: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1-devel
    line 122: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt-proc
real 0.07
user 0.06
sys 0.00
warning: Macro expanded in comment on line 17: %{name}-%{version}.tar.gz
warning: line 50: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1
warning: line 73: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt1-devel
warning: line 122: It's not recommended to have unversioned Obsoletes: Obsoletes:	libxslt-proc
Writing git revision for tag tld/libxslt-1.1.39-1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.20s sys:0.37s real:3.37s (faults io:2 non-io:221262)
Files queued for ftp:
   1592670 libxslt-1.1.39-1.src.rpm
       186 libxslt-1.1.39-1.src.rpm.uploadinfo
End-TLD-Builder-Info