kdesrc-build fails to run (Unescaped left brace in regex is illegal here in regex)

[opi]

kdesrc-build outputs an error on startup

$ kdesrc-build kdevelop-pg-qt kdevelop
given is experimental at /usr/bin/kdesrc-build line 877.
when is experimental at /usr/bin/kdesrc-build line 878.
when is experimental at /usr/bin/kdesrc-build line 884.
when is experimental at /usr/bin/kdesrc-build line 893.
when is experimental at /usr/bin/kdesrc-build line 898.
when is experimental at /usr/bin/kdesrc-build line 902.
given is experimental at /usr/bin/kdesrc-build line 2181.
when is experimental at /usr/bin/kdesrc-build line 2182.
when is experimental at /usr/bin/kdesrc-build line 2183.
when is experimental at /usr/bin/kdesrc-build line 2184.
given is experimental at /usr/bin/kdesrc-build line 4110.
when is experimental at /usr/bin/kdesrc-build line 4111.
when is experimental at /usr/bin/kdesrc-build line 4112.
when is experimental at /usr/bin/kdesrc-build line 4113.
when is experimental at /usr/bin/kdesrc-build line 4114.
when is experimental at /usr/bin/kdesrc-build line 4115.
when is experimental at /usr/bin/kdesrc-build line 4116.
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/(\${ <-- HERE MODULE})|(\$MODULE\b)/ at /usr/bin/kdesrc-build line 4759.

Package: kdesrc-build 1.15.1-1.1

[opi (opi-gmx)]

RedHat Bugzilla entry https://bugzilla.redhat.com/show_bug.cgi?id=1580105

[opi (opi-gmx)]

This package is 7 years old, latest one is v18.10