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Description of problem:
rsync refuses to work with the -z parameter if the destination host uses rsync-3.1.2-2 (i.e. the version from RHEL 7.5), but the source host is still using rsync-3.0.9-18 (i.e. the version from RHEL 7.4).

Version-Release number of selected component (if applicable):
rsync-3.1.2-2.el7.ppc64le (destination)
rsync-3.0.9-18.el7.x86_64 (source)

How reproducible:
100%

Steps to Reproduce:
1. Install rsync-3.1.2-2 on the destination, and rsync-3.0.9-18 on the source
2. rsync -z somefile user@destinationhost:

Actual results:
rsync: This rsync lacks old-style --compress due to its external zlib.  Try -zz.
rsync error: syntax or usage error (code 1) at main.c(1567) [server=3.1.2]
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=3.0.9]

Expected results:
rsync copies the file successfully.

Additional info:
Using "-zz" as suggested by the error message does not help here. The error stays the same with "-zz"

Hi Thomas, 

I was a bit too quick about the decision to drop the included zlib. Thanks for pointing this out. I will rebuild the package with the included zlib.

The bug of version 3.1.2-2 is discoverable by TC#554671. Fixed in 3.1.2-4.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0692