$NetBSD: patch-abc_Makefile,v 1.1 2024/03/02 02:03:37 thorpej Exp $

Also skip -ldl and -lrt on NetBSD.

--- abc/Makefile.orig	2024-03-01 23:09:30.203342910 +0000
+++ abc/Makefile	2024-03-01 23:10:15.700143598 +0000
@@ -137,11 +137,11 @@ endif
 
 # LIBS := -ldl -lrt
 LIBS += -lm
-ifneq ($(OS), $(filter $(OS), FreeBSD OpenBSD))
+ifneq ($(OS), $(filter $(OS), FreeBSD OpenBSD NetBSD))
   LIBS += -ldl
 endif
 
-ifneq ($(OS), $(filter $(OS), FreeBSD OpenBSD Darwin))
+ifneq ($(OS), $(filter $(OS), FreeBSD OpenBSD NetBSD Darwin))
    LIBS += -lrt
 endif