The man pages for asinh, acosh, and atanh state "The variant returning double also conforms to SVr4, 4.3BSD, C89." However, the C89 designation is not correct for two reasons: 1. Section 7.5.2, "Trigonometric functions" of the ISO C standard does not mention asinh, acosh, or atanh. 2. Relatively recent, C89-conformant Microsoft compilers don't support these functions. See: https://stackoverflow.com/questions/15539116/atanh-arc-hyperbolic-tangent-function-missing-in-ms-visual-c https://mail.kde.org/pipermail/calligra-devel/2012-December/007686.html The incorrect information on the man pages caused some confusion for the Wine project today as we discussed whether or not we need precompiler checks for these functions: https://www.winehq.org/pipermail/wine-devel/2017-July/118364.html I will send a patch to the mailing list shortly to correct these pages.
Resolved by a patch sent by the bug reporter