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preprocessor
预处理器

preprocessor directives
预处理指令

preprocessor command:
预处理程序命令 ：

emptied by preprocessor
由预处理器清空

line-matching preprocessor command:
行匹配预处理命令 ：

file encoding for preprocessor files:
预处理文件的文件编码 ：

you can make the configure script looks for header files and libraries in non-standard locations by specifying additional flags to pass to the c preprocessor and linker, such as:
env cppflags=-i/path/to/include ldflags=-l/path/to/library ./configure