Add comment about add-on numbering.

diff --git a/FAQ.in b/FAQ.in
index 1e4410829ab325aa9ed5bd8c53f4e8cfe50a6b3e..22b4d900038ef691fd136f85d5660916758df36c 100644 (file)
--- a/FAQ.in
+++ b/FAQ.in
@@ -236,6 +236,11 @@ files, provide support for additional architectures, and just about anything
 else.  The existing makefiles do most of the work; only some few stub rules
 must be written to get everything running.
 
+Most add-ons are tightly coupled to a specific GNU libc version.  Please
+check that the add-ons work with the GNU libc.  For example the crypt and
+linuxthreads add-ons have the same numbering scheme as the libc and will in
+general only work with the corresponding libc.
+
 ??     My XXX kernel emulates a floating-point coprocessor for me.
        Should I enable --with-fp?