$ grep -Fi lz4 beehive/logs/Sisyphus-x86_64/latest/success/openvpn-2.4.6-alt2 |head <13>Mar 25 03:30:18 rpmi: liblz4-1:1.8.3-alt2 sisyphus+221902.4200.4.1 1550599364 installed checking for LZ4... no checking lz4.h usability... no checking lz4.h presence... no checking for lz4.h... no usable LZ4 library or header not found, using version in src/compat/compat-lz4.*
JFYI, http://git.altlinux.org/people/sem/packages/openvpn.git?p=openvpn.git;a=commitdiff;h=f2d49727ca6c9e9d68bf5dfa9206a3843b3d88bf
openvpn-2.4.7-alt1 -> sisyphus: Thu May 02 2019 Nikolay A. Fetisov <naf@altlinux> 2.4.7-alt1 - New version - Use system liblz4 (thanks Mikhail Efremov, @sem) (Closes: 36389)