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`.FEATURES'     Expands to a list of special features supported by this version of     `make'.  Possible values include:    `archives'          Supports `ar' (archive) files using special filename syntax.          *Note Using `make' to Update Archive Files: Archives.    `check-symlink'          Supports the `-L' (`--check-symlink-times') flag.  *Note          Summary of Options: Options Summary.    `else-if'          Supports "else if" non-nested conditionals.  *Note Syntax of          Conditionals: Conditional Syntax.    `jobserver'          Supports "job server" enhanced parallel builds.  *Note          Parallel Execution: Parallel.    `second-expansion'          Supports secondary expansion of prerequisite lists.    `order-only'          Supports order-only prerequisites.  *Note Types of          Prerequisites: Prerequisite Types.    `target-specific'          Supports target-specific and pattern-specific variable          assignments.  *Note Target-specific Variable Values:          Target-specific.`.INCLUDE_DIRS'     Expands to a list of directories that `make' searches for included     makefiles (*note Including Other Makefiles: Include.).

`.FEATURES'

展开为此版本的make 支持的特殊功能列表，可能的值包括：

`archives'

支持 使用特殊的文件名语法 来 ar 文件。*Note Using 'make' to Update Archive Files: Archives.

`check-symlink'

支持 -L (--check-symlink-times)标志 *Note Summary of Options: Options Summary

`else-if'

支持 "eles if" 非递归式条件式。*Note Syntax of Conditionals : Conditional Syntax.

`jobserver'

支持 "job server" 强化并行构建。*Note Parallel Execution: Parallel.

`second-expansion'

支持对前提条件列表的二次扩展。

`order-only'

支持仅排序前提条件。*Note Types of Prerequisites: Prerequeisite Types.

`target-specific'

支持 目的特定的和模式特定的变量赋值。 *Note Target-specific Variable Values: Target-specific.

`.INCLUDE_DIRS'

扩展为make 为包含的makefile而搜索的目录的列表(*note Including Other Makefiles: Include)

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