CMake project configures fine on command line, fails in CLion

So one day after resetting my CMake cache and reloading the project I got this error:

Error:Configuration Debug
Cannot copy files to $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/Debug: $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/__default__/third_party/libpng16/libpng.so (No such file or directory)
Error:Configuration Release
Cannot copy files to $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/Release: $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/__default__/third_party/libpng16/libpng.so (No such file or directory)
Error:Configuration RelWithDebInfo
Cannot copy files to $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/RelWithDebInfo: $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/__default__/third_party/libpng16/libpng.so (No such file or directory)
Error:Configuration MinSizeRel
Cannot copy files to $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/MinSizeRel: $HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/__default__/third_party/libpng16/libpng.so (No such file or directory)

I originally thought it was do to a change in my project so I sync'd to older versions and tried to build but they had the error, too.  I tried *lots* of stuff and then the error magically went away.  It happened again after resetting my cache and again magically went away.  Then I reset my cache again to try to figure out which of my syncs or rebuilds fixed the problem but the problem persists.

FYI

$HOME/.CLion2016.2/system/cmake/generated/FOO-f8d556c5/f8d556c5/__default__/third_party/libpng16/libpng.so is a symbolic link

lrwxrwxrwx 1 vharron eng 11 Nov 2 12:08 libpng.so -> libpng16.so

libpng16.so doesn't exist

Why are you copying this file?  I think you need to just mirror the symlink if you really need to copy it.