>From the log:
arm-linux-gnueabihf-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions 
-Wl,-z,relro -Wl,-rpath-link,/home/pi/Sage/sage-9.4/local/lib 
-L/home/pi/Sage/sage-9.4/local/lib 
-Wl,-rpath,/home/pi/Sage/sage-9.4/local/lib -shared -O2 -g 
build/temp.linux-armv7l-3.7/build/src.linux-armv7l-3.7/numpy/core/src/umath/loops_unary_fp.dispatch.neon.o
 
build/temp.linux-armv7l-3.7/build/src.linux-armv7l-3.7/numpy/core/src/umath/loops_unary_fp.dispatch.o...
 
3.7/numpy/core/src/common/ufunc_override.o 
build/temp.linux-armv7l-3.7/numpy/core/src/common/numpyos.o 
build/temp.linux-armv7l-3.7/build/src.linux-armv7l-3.7/numpy/core/src/common/npy_cpu_features.o
 
build/temp.linux-armv7l-3.7/numpy/core/src/common/cblasfuncs.o 
build/temp.linux-armv7l-3.7/numpy/core/src/common/python_xerbla.o 
-L/usr/lib/arm-linux-gnueabihf -L/usr/lib -Lbuild/temp.linux-armv7l-3.7 
-lnpymath -lopenblas -lblas -lm -o 
build/lib.linux-armv7l-3.7/numpy/core/_multiarray_umath.cpython-37m-arm-linux-gnueabihf.so
 
/usr/lib/gcc/arm-linux-gnueabihf/8/include/arm_neon.h: In function 
'FLOAT_reciprocal_NEON': 
/usr/lib/gcc/arm-linux-gnueabihf/8/include/arm_neon.h:10394:10: fatal 
error: You must enable NEON instructions (e.g. -mfloat-abi=softfp 
-mfpu=neon) to use these intrinsics. return 
(float32x4_t)__builtin_neon_vld1v4sf ((const __builtin_neon_sf *) __a); ^ 
compilation terminated. 

On Friday, September 3, 2021 at 12:34:54 PM UTC-7 richard...@gmail.com 
wrote:

> Sage-9.4 failed to build from source on a machine and OS on which 
> Sage-9.3 built successfully.  This time it was on the same hardware as 
> before but a different OS.
>
> Babette is a Raspberry Pi 4B with 8GB ram. I'm including the results of 
> the various queries for machine information and attaching the requested 
> log files.  I ran make several times until the only thing unresolved was 
> numpy-1.20.3.    I also installed numpy-1.20.3 using pip3 before running 
> configure and make, though it doesn't seem to be used.
>
> pi@Babette:~/Sage/sage-9.4 $ cat /proc/version
> Linux version 5.10.52-v7l+ (dom@buildbot) (arm-linux-gnueabihf-gcc-8 
> (Ubuntu/Linaro 8.4.0-3ubuntu1) 8.4.0, GNU ld (GNU Binutils for Ubuntu) 
> 2.34) #1441 SMP Tue Aug 3 18:11:56 BST 2021
>
> pi@Babette:~/Sage/sage-9.4 $ cat /etc/*-release
> PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
> NAME="Raspbian GNU/Linux"
> VERSION_ID="10"
> VERSION="10 (buster)"
> VERSION_CODENAME=buster
> ID=raspbian
> ID_LIKE=debian
> HOME_URL="http://www.raspbian.org/";
> SUPPORT_URL="http://www.raspbian.org/RaspbianForums";
> BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs";
>
> pi@Babette:~/Sage/sage-9.4 $ python --version
> Python 2.7.16
>
> pi@Babette:~/Sage/sage-9.4 $ python3 --version
> Python 3.7.3
>
> pi@Babette:~/Sage/sage-9.4 $ pip3 list | grep numpy
> numpy             1.20.3
>
>

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