[Interest] Issue compiling qt 5.6.2

[Etienne Sandré-Chardonnal]

Dear all,

I'm trying to switch from Qt 5.6.1 to 5.6.2, using the same exact command
line to configure and compile.

configure works and properly detects system-png (I need to compile agains
my own libpng)

but building ends very quickly on "ERROR : libpng development package not
found"

The build works with 5.6.1 but not 5.6.2, and googling for this error gives
no answer. Also, the error message is not very clear, I'm not sure which
file is not found.

Thanks in advance!

Regards
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