Man pages matching name xcreatepixmapcursor in section 3:

XCreatePixmapCursor.3.en	debian 10 / libx11-doc
XCreatePixmapCursor.3.en	debian 11 / libx11-doc
XCreatePixmapCursor.3.en	debian 12 / libx11-doc
XCreatePixmapCursor.3.en	debian 13 / libx11-doc