Index: BOOK/cross-tools/common/m4.xml
===================================================================
--- BOOK/cross-tools/common/m4.xml (revision e8cb61ff4523a34c9840f546e22e4c0512500153)
+++ BOOK/cross-tools/common/m4.xml (revision 50dce17017055f0e9ee67f9fb45ebdc4ee573ed4)
@@ -23,6 +23,9 @@
Installation of M4
- Here we will install an m4 binary that can run on
- the host system, as this program is required by GMP.
+ 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: