diff --git a/configure.ac b/configure.ac
index 7b6d5b9..d02e16d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -357,17 +357,21 @@ AC_ARG_ENABLE([arm-neon],
[case "$enableval" in
no|off)
# disable the default enabling on __ARM_NEON__ systems:
+ AC_DEFINE([PNG_ARM_NEON], [], [ARM NEON support])
AC_DEFINE([PNG_ARM_NEON_OPT], [0],
[Disable ARM Neon optimizations])
# Prevent inclusion of the assembler files below:
enable_arm_neon=no ;;
check)
+ AC_DEFINE([PNG_ARM_NEON], [], [ARM NEON support])
AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
[Check for ARM Neon support at run-time]);;
api)
+ AC_DEFINE([PNG_ARM_NEON], [], [ARM NEON support])
AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
[Turn on ARM Neon optimizations at run-time]);;
yes|on)
+ AC_DEFINE([PNG_ARM_NEON], [], [ARM NEON support])
AC_DEFINE([PNG_ARM_NEON_OPT], [2],
[Enable ARM Neon optimizations])
AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if]
diff --git a/pngpriv.h b/pngpriv.h
index 2e426cf..fb521cf 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -127,7 +127,7 @@
* associated assembler code, pass --enable-arm-neon=no to configure
* or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
*/
-# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
+# if defined(PNG_ARM_NEON) && (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
defined(PNG_ALIGNED_MEMORY_SUPPORTED)
# define PNG_ARM_NEON_OPT 2
# else
