#### Linux From Scratch - Version 10.1-rc1

### Chapter 8. Installing Basic System Software

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# 8.12. M4-1.4.18

The M4 package contains a macro processor.

Approximate build time: 0.4 SBU
Required disk space: 32 MB

## 8.12.1. Installation of M4

First, make some fixes required by glibc-2.28 and later:

    sed -i 's/IO_ftrylockfile/IO_EOF_SEEN/' lib/*.c
    echo "#define _IO_IN_BACKUP 0x100" >> lib/stdio-impl.h

Prepare M4 for compilation:

    ./configure --prefix=/usr

Compile the package:

    make

To test the results, issue:

    make check

Install the package:

    make install

## 8.12.2. Contents of M4

Installed program: m4

### Short Descriptions

m4 | Copies the given files while expanding the macros that they contain. These macros are either built-in or user-defined and can take any number of arguments. Besides performing macro expansion, m4 has built-in functions for including named files, running Unix commands, performing integer arithmetic, manipulating text, recursion, etc. The m4 program can be used either as a front-end to a compiler or as a macro processor in its own right

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