Man pages matching name pmderivederrstr in section 3:

pmDerivedErrStr.3.en	debian 10 / libpcp3-dev
pmderivederrstr.3.en	debian 10 / libpcp3-dev
pmDerivedErrStr.3.en	debian 11 / libpcp3-dev
pmDerivedErrStr.3.en	debian 12 / libpcp3-dev