--- a/Source/LibPNG/pngpriv.h 2018-07-16 11:58:00.000000000 +0200 +++ b/Source/LibPNG/pngpriv.h 2018-08-07 10:15:53.827327997 +0200 @@ -107,6 +107,7 @@ * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely * do this. */ +#define PNG_ARM_NEON_OPT 0 #ifndef PNG_ARM_NEON_OPT /* ARM NEON optimizations are being controlled by the compiler settings, * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon