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Description of problem:

rebuilding autoconf-2.63-5.1.el6.src.rpm fails.

Version-Release number of selected component (if applicable):

2.63-5.1.el6

How reproducible:

Try to build autoconf on a system without xv installed.

Steps to Reproduce:
1. sudo yum remove xz
2. rpmbuild -bb autoconf.spec
  
Actual results:

> rpmbuild -ba autoconf.spec
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.63939
+ umask 022
+ cd /tmp/rpmbuild/BUILD
+ LANG=C
+ export LANG
+ unset DISPLAY
+ cd /tmp/rpmbuild/BUILD
+ rm -rf autoconf-2.63
+ tar -xf -
+ /usr/bin/lzma -dc /tmp/rpmbuild/SOURCES/autoconf-2.63.tar.lzma
/var/tmp/rpm-tmp.63939: line 31: /usr/bin/lzma: No such file or directory
tar: This does not look like a tar archive
tar: Error exit delayed from previous errors
error: Bad exit status from /var/tmp/rpm-tmp.63939 (%prep)


Expected results:

Create rpms.

Additional info:

Yum can't remove xz if rpm-build is installed as rpm-build requires xz and lzma. 
Please check with 'package-cleanup --problems' if there are any package dependency issues on your system. You can find that script in the yum-utils package.