I forgot to mention MAKECONF points to a custom "mk.conf" which contains:
# mk.conf
MKDEBUG=yes
MKDEBUG_LIB=yes
USE_PIGZGZIP=yes
.if "${MACHINE}" == "i386" || "${MACHINE}" == "amd64"
DBG=-g
.endif
so perhaps the failure is triggered by "MKDEBUG" and/or "MKDEBUG_LIB".
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