Hello again @tomoaki0705 , thank you very much for your continued assistance.
[osboxes:/opencv/opencv] $ aarch64-linux-gnu-g++ cmake/checks/cpu_neon.cpp
In file included from cmake/checks/cpu_neon.cpp:8:0:
/usr/lib/gcc/aarch64-linux-gnu/4.9/include/arm_neon.h: In function 'uint8x8_t vqadd_u8(uint8x8_t, uint8x8_t)':
/usr/lib/gcc/aarch64-linux-gnu/4.9/include/arm_neon.h:2116:51: error: '__builtin_aarch64_uqaddv8qi_uuu' was not declared in this scope
return __builtin_aarch64_uqaddv8qi_uuu (__a, __b);
... similar errors