Details on this package are located in Section 10.9.2, “Contents of M4.”
The M4 package contains a macro processor.
          M4 is required to build GMP. We will compile and install an
          m4 program into
          /cross-tools, so that we have a
          known-good version which can be used to build GMP, both in
          Cross-Tools and the Temporary System.
        
Prepare M4 for compilation:
./configure --prefix=/cross-tools
Compile the package:
make
Install the package:
make install
Details on this package are located in Section 10.9.2, “Contents of M4.”