Выполнение brp-alt для уже собранных пакетов рабоатет так:

$ ./rpmpeek ~/RPM/RPMS/perl-base-5.8.7-alt2.i686.rpm /usr/lib/rpm/brp-alt
Cleaning files in /home/at/tmp/rpmpeek.bGwN4887 ()
Compressing files in /home/at/tmp/rpmpeek.bGwN4887 ()
Verifying ELF objects in /home/at/tmp/rpmpeek.bGwN4887 (rpath=normal,textrel=normal)
Adjusting library links in /home/at/tmp/rpmpeek.bGwN4887
./usr/lib:
        libperl.so.5.8 -> libperl.so.5.8.7
./usr/lib/perl5/unicore/lib:
$

--- rpmpeek-	2005-09-13 18:25:00 +0000
+++ rpmpeek	2005-09-18 10:19:52 +0000
@@ -29,6 +29,7 @@ rpm2cpio "$1" |(cd "$tmpdir"; fakeroot -
 	cpio -idmu --quiet --no-absolute-filenames) || exit 2
 shift
 cd "$tmpdir"
+export RPM_BUILD_ROOT="$tmpdir"
 fakeroot -i .fakedata -- "$@" || exit 1
 
 : <<'__EOF__'