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Update tutorial-ubuntu-16.04.md

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examples/tutorial-ubuntu-16.04.md
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@ -147,4 +147,12 @@ See [here](http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html) fo
```
-Wl,--export-dynamic
```
incantation.
incantation. The salient point being
```
"In some cases, the call to gcc to create the object file will also need to include the option
'-Wl,-export-dynamic'. Normally, the dynamic symbol table contains only symbols which
are used by a dynamic object. This option (when creating an ELF file) adds all symbols to the
dynamic symbol table (see ld(1) for more information). You need to use this option when there are
'reverse dependencies', i.e., a DL library has unresolved symbols that by convention must be
defined in the programs that intend to load these libraries."
```