Known bugs in libpng version 1.4.2 May 16, 2010 Some quotation marks are missing in the aix block of configure and configure.ac STATUS: This is fixed in libpng-1.4.3beta01. We changed aix*) LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG -D_ALL_SOURCE;; to this aix*) LIBPNG_DEFINES="-DPNG_CONFIGURE_LIBPNG -D_ALL_SOURCE";; in configure and configure.ac