/usr/bin/argon2 in argon2-20161029-4.fc28.x86_64 and /usr/lib64/libargon2.so.0 in libargon2-20161029-4.fc28.x86_64 have not been linked with the standard Fedora linker flags (LDFLAGS) from redhat-rpm-config: cc -std=c89 -pthread -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -mcet -fcf-protection -g -Iinclude -Isrc src/argon2.c src/core.c src/blake2/blake2b.c src/thread.c src/encoding.c src/opt.c src/run.c -o argon2 … cc -std=c89 -pthread -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -mcet -fcf-protection -g -Iinclude -Isrc -shared -fPIC -fvisibility=hidden -DA2_VISCTL=1 -Wl,-soname,libargon2.so.0 src/argon2.c src/core.c src/blake2/blake2b.c src/thread.c src/encoding.c src/opt.c -o libargon2.so CFLAGS are there, but LDFLAGS are missing. See https://src.fedoraproject.org/rpms/redhat-rpm-config/blob/master/f/buildflags.md for information on RPM macros and environment variables provided by the build environment.
Fixed by https://src.fedoraproject.org/rpms/argon2/c/a65cc9516cbcd51498b102bdd32f6d11168f6212?branch=f28
argon2-20161029-5.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-afb832ae0e
argon2-20161029-5.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-afb832ae0e
argon2-20161029-5.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.