Add note about devpts relating to the test suites.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2855 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter02/abouttestsuites.xml

@@ -11,7 +11,7 @@ free.</para>
 
 <para>Some test suites are more important than others. For example, the test
 suites for the core toolchain packages -- GCC, Binutils, and Glibc (the C
-library) -- are of the utmost importance due to their central positioning in a
+library) -- are of the utmost importance due to their central role in a
 properly functioning system. But be warned, the test suites for GCC and Glibc
 can take a very long period of time to complete, especially on slower
 hardware.</para>
@@ -21,5 +21,12 @@ run the various test suites, we'll guide you on the relative importance of
 the test suite in question so that you can decide for yourself whether to
 run it or not.</para>
 
+<note><para>A common problem when running the test suites for Binutils and GCC
+is running out of pseudo terminals (PTYs for short). The symptom is an unusually
+high number of failing tests. This can happen for any number of reasons. Most
+likely is that the host system doesn't have the <emphasis>devpts</emphasis> file
+system set up correctly. We'll discuss this in more detail later on in Chapter
+5.</para></note>
+
 </sect1>