$NetBSD$

configure SDL_mixer and remove undefined include

--- src/sim/makefile.orig	2018-08-21 05:12:24.952808425 +0000
+++ src/sim/makefile
@@ -5,8 +5,8 @@ TCLXHOME = ../tclx
 TCLLIBRARY = /usr/local/lib/tcl
 TKLIBRARY = /usr/local/lib/tk
 
-SDLINCLUDE = $$(/bin/sh ./sdl_helper cflags)
-SDLLIBS = $$(/bin/sh ./sdl_helper libs)
+SDLINCLUDE = `pkg-config --cflags SDL_mixer` -DWITH_SDL_MIXER
+SDLLIBS = `pkg-config --libs SDL_mixer`
 
 CC = gcc
 
@@ -25,13 +25,12 @@ DEFINES = -DIS_LINUX -DORIGINAL_MONSTER_
 CFLAGS += $(OPTFLAGS) $(DEFINES) -Wall
 
 #LDFLAGS = -Bstatic
-LDFLAGS=-L/usr/X11/lib -L/usr/X11R6/lib
+LDFLAGS+=-L/usr/X11/lib -L/usr/X11R6/lib
 
 INSTALL = install -s
 
 INCLUDES = \
 	-Iheaders \
-	-I$(XPMHOME) \
 	-I$(XINCLUDE) \
 	-I$(TCLHOME) \
 	-I$(TCLXHOME)/src \