diff -r a797ad9c7bd5 -r 165eff2a1e10 config/libc/glibc-eglibc.in-common
--- a/config/libc/glibc-eglibc.in-common	Thu Nov 11 01:11:17 2010 +0100
+++ b/config/libc/glibc-eglibc.in-common	Mon Jan 31 19:52:18 2011 +0100
@@ -77,6 +77,21 @@
 
       If this option is not set, (e)glibc will choose for you.
 
+config LIBC_GLIBC_FORCE_UNWIND
+    bool
+    prompt "Force unwind support (READ HELP!)"
+    default n
+    help
+      If your toolchain fails building while building the C library
+      start files, or the complete C library, with a message like:
+        configure: error: forced unwind support is required
+      
+      then you may try setting this to 'y'. Otherwise, leave it to 'n'.
+      
+      The issue seems to be related to building NPTL on old versions
+      of glibc (and possibly eglibc as well) on some architectures
+      (seen on s390, s390x and x86_64).
+
 config LIBC_GLIBC_USE_PORTS
     bool
     prompt "Use the ports addon"