* using log directory 'd:/Rcompile/CRANpkg/local/4.0/maple.Rcheck'
* using R version 4.0.5 (2021-03-31)
* using platform: x86_64-w64-mingw32 (64-bit)
* using session charset: ISO8859-1
* checking for file 'maple/DESCRIPTION' ... OK
* this is package 'maple' version '0.99.5'
* package encoding: UTF-8
* checking package namespace information ... OK
* checking package dependencies ... ERROR
Package required but not available: 'spruce'

See section 'The DESCRIPTION file' in the 'Writing R Extensions'
manual.
* DONE
Status: 1 ERROR