Add a note about (maybe) needing to do ldconfig after make install

on Ubuntu. This is a workaround for Issue #153.
esnet · Apr 17, 2014 · 32f50a2 · 32f50a2
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diff --git a/README.md b/README.md
@@ -145,3 +145,7 @@ doubles the value you pass in. (You can see this using iperf3's debug flag).
 But then the CWND does not actually ramp up to the doubled value, but only
 to about 75% of the doubled value. This appears to be by design.
 
+* On some platforms (observed on at least one version of Ubuntu
+Linux), it might be necessary to invoke "ldconfig" manually after
+doing a "make install" before the iperf3 executable can find its
+shared library.  (Issue #153)
diff --git a/docs/dev.rst b/docs/dev.rst
@@ -105,6 +105,11 @@ to solve the problem are currently being made:
   value.  Some part of this behavior is documented in the tcp(7)
   manual page.  (Issue #145)
 
+* On some platforms (observed on at least one version of Ubuntu
+  Linux), it might be necessary to invoke ``ldconfig`` manually after
+  doing a ``make install`` before the ``iperf3`` executable can find
+  its shared library.  (Issue #153)
+
 There are, of course, many other open and closed issues in the issue
 tracker.