+ (qpng_access_version_number() / 100 == 102) ? PNG_LIBPNG_VER_STRING_12 :
+ (qpng_access_version_number() / 100 == 104) ? PNG_LIBPNG_VER_STRING_14 :
+ (qpng_access_version_number() / 100 == 105) ? PNG_LIBPNG_VER_STRING_15 :
+ PNG_LIBPNG_VER_STRING_16, // nasty hack... whatever