Add missing build time libpng dependency

sciapp / gr

GR framework: a graphics library for visualisation applications

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Add missing build time libpng dependency #101

Closed kou closed 4 years ago

kou commented 4 years ago

This is needed for "make -jN" build. If we don't have this, we may use libpng before we build 3rdparty/libpng16/. It causes "no such file or directory: .../libpng.a" error.

jheinen commented 4 years ago

We will check this (next week) and probably merge it into the development branch.

FlorianRhiem commented 4 years ago

Thank you for the fix! I've merged it into develop.