Hi, perhaps this happens due to some oddity in my system, but I have noticed meesages like this while doing updates via yum (this has happened today)

Downloading packages: updates/21/x86_64/prestodelta | 621 kB 00:00 Delta RPMs reduced 21 M of updates to 1.4 M (93% saved) (1/13): gdal-libs-1.11.1-4.fc21_1.11.1-5.fc21.x86_64.drpm | 463 kB 00:00 (2/13): gdal-python-1.11.1-4.fc21_1.11.1-5.fc21.x86_64.drpm | 42 kB 00:00 (3/13): glpk-4.53-5.fc21_4.53-6.fc21.x86_64.drpm | 87 kB 00:00 (4/13): harfbuzz-0.9.35-1.fc21_0.9.36-1.fc21.i686.drpm | 40 kB 00:00 (5/13): harfbuzz-0.9.35-1.fc21_0.9.36-1.fc21.x86_64.drpm | 41 kB 00:00 (6/13): harfbuzz-icu-0.9.35-1.fc21_0.9.36-1.fc21.x86_64.drp | 11 kB 00:00 (7/13): libgeotiff-1.2.5-16.fc21_1.4.0-2.fc21.x86_64.drpm | 323 kB 00:00 (8/13): phonon-4.8.1-1.fc21_4.8.2-1.fc21.x86_64.drpm | 49 kB 00:00 (9/13): qt5-qtlocation-5.4.0-1.fc21_5.4.0-2.fc21.x86_64.drp | 71 kB 00:00 (10/13): qt5-qtsensors-5.4.0-1.fc21_5.4.0-2.fc21.x86_64.drp | 22 kB 00:00 (11/13): stoken-libs-0.8-2.git.ba44603.fc21_0.81-1.fc21.x86 | 21 kB 00:00 (12/13): wireshark-1.12.2-1.fc21_1.12.2-2.fc21.x86_64.drpm | 271 kB 00:00 (13/13): wireshark-gnome-1.12.2-2.fc21.x86_64.rpm | 1.0 MB 00:00 Finishing delta rebuilds of 10 package(s) (20 M) /usr/sbin/prelink: No such file or directory prelink not installed, cannot undo prelinking/usr/sbin/prelink: No such file or directory prelink not installed, cannot undo prelinking/usr/sbin/prelink: No such file or directory prelink not installed, cannot undo prelinking/usr/sbin/prelink: No such file or directory /usr/sbin/prelink: No such file or directory ] 0.0 B/s | 1.9 MB --:-- ETA Some delta RPMs failed to download or rebuild. Retrying../s | 20 MB 00:00 ETA (1/5): harfbuzz-0.9.36-1.fc21.i686.rpm | 164 kB 00:00 (2/5): harfbuzz-0.9.36-1.fc21.x86_64.rpm | 160 kB 00:00 (3/5): harfbuzz-icu-0.9.36-1.fc21.x86_64.rpm | 17 kB 00:00 (4/5): libgeotiff-1.4.0-2.fc21.x86_64.rpm | 716 kB 00:00 (5/5): stoken-libs-0.81-1.fc21.x86_64.rpm | 43 kB 00:00

So it seems that the reconstruction of certain packages fails due to prelink missing?

Regards, Sergio