$NetBSD$

long options need two dashes.

--- Makefile.in.orig	2025-02-23 20:39:21.000000000 +0000
+++ Makefile.in
@@ -87,7 +87,7 @@ DOCEXTRA = *.asy *.csv *.dat latexusage.
 KEYWORDS = base $(ASYMPTOTE_SITEDIR)
 LATEXFILES = asymptote.sty asycolors.sty latexmkrc
 CONTEXTFILES = colo-asy.tex
-ASY = ./asy -dir base -config "" -render=0
+ASY = ./asy --dir base --config "" --render=0
 
 DEFS = @DEFS@ @OPTIONS@ @PTHREAD_CFLAGS@ -DFFTWPP_SINGLE_THREAD -Wall -I.
 CFLAGS = @CFLAGS@