Details on this package are located in Section 8.14.2, “Contents of M4.”
The M4 package contains a macro processor.
Prepare M4 for compilation:
./configure --prefix=/usr   \
            --host=$LFS_TGT \
            --build=$(build-aux/config.guess)
        Compile the package:
make
Install the package:
make DESTDIR=$LFS install
Details on this package are located in Section 8.14.2, “Contents of M4.”