Lilypond - '\on-the-fly #print-page-number-check-first' not working in version 2.24.1 anymore

Question

I used the following code for page numbering and copyright formatting in lilypond --version 2.20.0:

pagenumcol = \markup {
  \column {
    \vspace #0.5
    \fromproperty #'page:page-number-string
  }
}

copyrightcol = "My Copyright file"

\paper {
  ragged-right = ##f
  page-breaking = #ly:page-turn-breaking

  oddHeaderMarkup = \markup \null
  evenHeaderMarkup = \markup \null

  oddFooterMarkup = \markup {
    \copyrightcol
    \on-the-fly #print-page-number-check-first
    \pagenumcol
  }

  evenFooterMarkup = \markup {
    \on-the-fly #print-page-number-check-first
    \pagenumcol
    \copyrightcol
  }
}

Now with lilypond --version 2.24.1 I get the following error:

GNU LilyPond 2.24.1 (running Guile 2.2)
Processing `First-Piano-two-hand-Exercises.ly'
Parsing...
./global-files/paper.ily:19:18: error: Guile signaled an error for the expression beginning here
    \on-the-fly #
                 print-page-number-check-first
Unbound variable: print-page-number-check-first
./global-files/paper.ily:19:17: error: wrong type for argument 1.  Expecting procedure, found #<unspecified>
    \on-the-fly 
                #print-page-number-check-first
ERROR: In procedure ly:parse-file:
In procedure reverse!: Wrong type argument in position 1: (#<unspecified> . #f)

Does anyone know how to fix this? A simple convert-ly run did not do :-(

Answer 1

Some further reading in the documentation and I found this:

\paper {
  print-page-number = ##t
  print-first-page-number = ##t
  oddHeaderMarkup = \markup \null
  evenHeaderMarkup = \markup \null
  oddFooterMarkup = \markup {
    \fill-line {
      \if \should-print-page-number
      \fromproperty #'page:page-number-string
    }
  }
  evenFooterMarkup = \oddFooterMarkup
}

I changed my code by replacing \on-the-fly #print-page-number-check-first with \if \should-print-page-number:

pagenumcol = \markup {
  \column {
    \vspace #0.5
    \fromproperty #'page:page-number-string
  }
}

copyrightcol = "My Copyright file"

\paper {
  ragged-right = ##f
  page-breaking = #ly:page-turn-breaking

  oddHeaderMarkup = \markup \null
  evenHeaderMarkup = \markup \null

  oddFooterMarkup = \markup {
    \copyrightcol
    \if \should-print-page-number
    \pagenumcol
  }
  
  evenFooterMarkup = \markup {
    \if \should-print-page-number
    \pagenumcol
    \copyrightcol
  }
}

It compiles without errors :-)