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(nasm.info)Section 4.10

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4.10. Other Preprocessor Directives
===================================

   NASM also has preprocessor directives which allow access to
information from external sources. Currently they include:

   The following preprocessor directive is supported to allow NASM to
correctly handle output of the cpp C language preprocessor.

   * `%line' enables NAsM to correctly handle the output of the cpp C
     language preprocessor (see *Note Section 4.10.1::).

   * `%!' enables NASM to read in the value of an environment variable,
     which can then be used in your program (see *Note Section
     4.10.2::).

Section 4.10.1

`%line' Directive

Section 4.10.2

`%!'`<env>': Read an environment variable.