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diff --git a/build/autoconf/arch.m4 b/build/autoconf/arch.m4
index b62ea71..53179a7 100644
--- a/build/autoconf/arch.m4
+++ b/build/autoconf/arch.m4
@@ -215,7 +215,7 @@ if test "$CPU_ARCH" = "arm"; then
AC_MSG_CHECKING(ARM version support in compiler)
dnl Determine the target ARM architecture (5 for ARMv5, v5T, v5E, etc.; 6 for ARMv6, v6K, etc.)
- ARM_ARCH=`${CC-cc} ${CFLAGS} -dM -E - < /dev/null | sed -n 's/.*__ARM_ARCH_\([[0-9]][[0-9]]*\).*/\1/p'`
+ ARM_ARCH=`${CC-cc} ${CFLAGS} -dM -E - < /dev/null | sed -n 's/.*__ARM_ARCH_\([[0-9]][[0-9]]*\).*/\1/p' | head -n 1`
AC_MSG_RESULT("$ARM_ARCH")
AC_MSG_CHECKING(for ARM NEON support in compiler)
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