Hi,
Centos6, nasm 2.13.03 (compiled from sources, custom path, exported into PATH)
It looks like configure does not take into consideration the new format of "2.13.03" (Superficial look at the code)
nasm -v
NASM version 2.13.03 compiled on May 2 2018
./configure
ERROR: Did not find a new enough assembler, install one or build with
--openssl-no-asm.
Please refer to BUILDING.md