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					. "IF_OPT value '$ENV{IF_OPT}' (expected one of -O0 -O1 -O2 "
					. "-O3 -Os -Og -Oz); using $opt\n";
			}
		}

		# -march=<value> lets the compiler target specific instruction-set
		# extensions (AVX2 gather + FMA, etc.) for the oblique dot product
		# and the fit-time min/max scan's `#pragma omp simd` loops.
		#
		# IF_ARCH=<value> sets it explicitly (e.g. "x86-64-v3", "skylake",
		# "znver3") -- validated against a conservative identifier charset
		# since, like IF_OPT, it flows into a compiler command line.
		# IF_NATIVE=1 remains as shorthand for IF_ARCH=native and is used
		# when IF_ARCH isn't set. Prefer a specific IF_ARCH value over
		# IF_NATIVE on a machine you don't control exclusively: blanket
		# -march=native pulls in whatever the build host has, including
		# AVX-512 on some Intel CPUs, which is known to trigger clock
		# throttling under sustained heavy use and can make throughput
		# *worse* than a conservative target like x86-64-v3 (AVX2, no
		# AVX-512). Either way, the cached artefact under _Inline/ is then
		# pinned to that instruction set, so leave both unset if the