Quartus 15.1 requires libpng12 ?

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very fast one..try do a search for libpng12.so.0 see if this files present.

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Not present. I do have :

libpng14.so.14 -> libpng14.so.14.12.0*

libpng.so.14 -> libpng14.so.14*

libpng.so -> libpng16.so*

libpng16.so.16 -> libpng16.so.16.19.0*

libpng.la -> libpng16.la*

libpng16.so -> libpng16.so.16.19.0*

Making a link to to libpng12.so.0 from libpng14.so.14.12.0

results in :

quartus: /usr/lib64/libpng12.so.0: version `PNG12_0' not found (required by /opt/altera_lite/15.1/quartus/linux64/libQtGui.so.4)