diff --git a/sys-devel/libtool/files/1.5.10/libtool-1.5.10-locking.patch b/sys-devel/libtool/files/1.5.10/libtool-1.5.10-locking.patch
new file mode 100644
--- /dev/null
+++ b/sys-devel/libtool/files/1.5.10/libtool-1.5.10-locking.patch
@@ -0,0 +1,17 @@
+Libtool uses links to handle locking object files with 
+dependencies.  Hard links can't cross filesystems though, 
+so we have to use a diff source for the link.
+
+http://bugs.gentoo.org/40992
+
+--- libtool-1.5.10/ltmain.in
++++ libtool-1.5.10/ltmain.in
+@@ -1005,7 +1005,7 @@
+     # Lock this critical section if it is needed
+     # We use this script file to make the link, it avoids creating a new file
+     if test "$need_locks" = yes; then
+-      until $run ln "$progpath" "$lockfile" 2>/dev/null; do
++      until $run ln "$srcfile" "$lockfile" 2>/dev/null; do
+ 	$show "Waiting for $lockfile to be removed"
+ 	sleep 2
+       done