libtiff installed but not finding it

[Tammy Diprima]

Hi!  I'm installing openslide (from github) on Ubuntu 16.04.  When I run
./configure, I get:

*configure: error: cannot find libtiff*

But!  When I go to install libtiff (sudo apt-get install libtiff5), it says:

*libtiff5 is already the newest version (4.0.6-1).*

So... how do I get past this error?

Thanks!
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