ASTAP is written in Object Pascal and compiled with the Free Pascal Compiler using Lazarus the open source cross platform IDE. 

For the Windows use the astap.lpi project file.
For the Mac use the astap_mac.lpi project file.
For Linux use the astap_linux.lpi project file.
For the command-line version use /command-line_version/astap_command_line.lpi

{Copyright (C) 2017 by Han Kleijn, www.hnsky.org
 email: han.k.. at...hnsky.org

This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/. 