Latest available version: IDA and decompilers v8.4.240320sp1 see all releases
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The following symbols are predefined in the IDC preprocessor:
  _NT_           IDA is running under MS Windows
  _LINUX_        IDA is running under Linux
  _MAC_          IDA is running under Mac OS X
  _UNIX_         IDA is running under Unix (linux or mac)
  _EA64_         64-bit version IDA
  _QT_           GUI version of IDA (Qt)
  _GUI           GUI version of IDA
  _TXT_          Text version of IDA
  _IDA_VERSION_  The current IDA version. For example: "8.4"
  _IDAVER_       The current, numerical IDA version. For example: "840" means v8.4

These symbols are also defined when parsing C header files.
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