Man pages matching name pango::attrunderlinecolor in section 3pm:

Pango::AttrUnderlineColor.3pm.en	debian 10 / libpango-perl
Pango::AttrUnderlineColor.3pm.en	debian 11 / libpango-perl
Pango::AttrUnderlineColor.3pm.en	debian 12 / libpango-perl