Guacamole - LibPNG undefined reference to 'png_set_longjmp_fn' -


when running make while installing guacamole 0.9.0, following error:

undefined reference 'png_set_longjmp_fn'` in /home/src/libguac/.libs/libguac.so.

apparently, error pops when there wrong libpng. tried install new version of libpng (16) error persisted. know how fix this? running ubuntu 14.01 , libpng version 12. in advance.


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