Xojo Developer Conference
25/27th April 2018 in Denver.
MBS Xojo Conference
6/7th September 2018 in Munich, Germany.

Platforms to show: All Mac Windows Linux Cross-Platform

FAQ.How to get the Mac OS Version using System.Gestalt?
Answer: Try this code:
Dim s As String
Dim b As Boolean
Dim i, resp as Integer

// Systemversion
b = System.Gestalt("sysv", resp)
If b then
s = Hex(resp)
For i =Len(s)-1 DownTo 1
MsgBox "Systemversion: Mac OS " + s
end if
Notes: The MBS Plugin has a SystemInformationMBS.OSVersionString function for this.

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MBS Xojo Chart Plugins