/usr/lib64/libgsm.so.1.0.17 in gsm-1.0.17-4.fc28.x86_64 and /usr/bin/tcat, /usr/bin/toast, /usr/bin/untoast in gsm-tools-1.0.17-4.fc28.x86_64 are not linked with the standard Fedora linker flags (LDFLAGS) from redhat-rpm-config. I tried to fix this from the RPM spec file, but it seems difficult to achieve because of the way make is invoked recursively. 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.
gsm-1.0.17-4.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-aa5edf1551
gsm-1.0.17-5.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-ac834ecfce
gsm-1.0.17-2.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-1e6641ec83
gsm-1.0.17-2.fc26 has been pushed to the Fedora 26 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-2018-1e6641ec83
gsm-1.0.17-4.fc27 has been pushed to the Fedora 27 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-aa5edf1551
gsm-1.0.17-5.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-ac834ecfce
gsm-1.0.17-2.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.
gsm-1.0.17-4.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
gsm-1.0.17-5.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.