$NetBSD: patch-makefile,v 1.1 2022/06/06 14:18:05 rhialto Exp $

Fix finding the png16 library.
Avoid using /usr/local.

--- makefile.orig	2022-03-19 07:49:08.000000000 +0000
+++ makefile
@@ -459,8 +459,8 @@ ifeq (${WIN32},)  #*nix Environments (&&
               OS_CCDEFS += -I/usr/pkg/include
             endif
             ifeq (/usr/local/lib,$(findstring /usr/local/lib,${LIBPATH}))
-              INCPATH += /usr/local/include
-              OS_CCDEFS += -I/usr/local/include
+              #INCPATH += /usr/local/include
+              #OS_CCDEFS += -I/usr/local/include
             endif
             ifneq (,$(findstring NetBSD,$(OSTYPE))$(findstring FreeBSD,$(OSTYPE))$(findstring AIX,$(OSTYPE)))
               LIBEXT = so
@@ -598,10 +598,10 @@ ifeq (${WIN32},)  #*nix Environments (&&
     OS_CCDEFS += -DHAVE_UTIME
   endif
   ifneq (,$(call find_include,png))
-    ifneq (,$(call find_lib,png))
+    ifneq (,$(call find_lib,png16))
       OS_CCDEFS += -DHAVE_LIBPNG
-      OS_LDFLAGS += -lpng
-      $(info using libpng: $(call find_lib,png) $(call find_include,png))
+      OS_LDFLAGS += -lpng16
+      $(info using libpng: $(call find_lib,png16) $(call find_include,png))
       ifneq (,$(call find_include,zlib))
         ifneq (,$(call find_lib,z))
           OS_CCDEFS += -DHAVE_ZLIB