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configure has non-posix bash syntax
which gives an error when run on a system that uses dash for /bin/sh.
The problem is at line 6464 which has
if test "$have_keyring" == "yes"
the double equal sign is non-posix bash syntax that isn't accepted by posix shells like dash. This was added 2020-05-25 according to git blame so looks like a recent problem.
On an Ubuntu 20.04 system with top of tree sources I get
gondor:2027$ ../qemu/configure --prefix=/home/wilson/FOSS/qemu/install-qemu-tmp --target-list=riscv64-linux-user,riscv64-softmmu,riscv32-linux-user,riscv32-softmmu
../qemu/configure: 6464: test: yes: unexpected operator
...
configure completes OK, so this is a minor problem. It is just one configure test that is failing to work properly.
Thanks for reporting! Seems like others ran into this problem, too - a patch is already on the list:
https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg08967.html
Fixed in commit b418d2656112174c; this will be in QEMU 5.1.
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