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add pkg-config libpng --cflags to set incldue dir when compile euspng
euspng requries <png.h> wihch libpng-dev provies, but irteus genrate png.h from png.l
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irteus/Makefile

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@@ -88,6 +88,8 @@ ifeq ($(HAVE_BULLET), 1)
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BULLETLIB=`pkg-config bullet --libs`
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endif
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PNG_CFLAGS=`pkg-config libpng --cflags`
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MODULES.L=irt_modules.l
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EUSLIB_MODULES.L=$(addprefix $(EUSDIR)/lib/,$(MODULES.L))
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@@ -284,7 +286,7 @@ $(INSTALLOBJDIR)/CBULLET.$(OSFX): CBULLET.cpp defun.h
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$(INSTALLOBJDIR)/eusbullet.$(OSFX): eusbullet.c defun.h
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$(CC) $(CFLAGS) $(WFLAGS) $(BULLETCFLAGS) -c eusbullet.c $(OBJOPT)$(INSTALLOBJDIR)/eusbullet.$(OSFX)
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$(INSTALLOBJDIR)/euspng.$(OSFX): euspng.c defun.h
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$(CC) $(CFLAGS) $(WFLAGS) -c euspng.c $(OBJOPT)$(INSTALLOBJDIR)/euspng.$(OSFX)
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$(CC) $(PNG_CFLAGS) $(CFLAGS) $(WFLAGS) -c euspng.c $(OBJOPT)$(INSTALLOBJDIR)/euspng.$(OSFX)
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$(INSTALLOBJDIR)/nr.$(OSFX): nr.c defun.h
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$(CC) $(CFLAGS) $(WFLAGS) -c nr.c $(OBJOPT)$(INSTALLOBJDIR)/nr.$(OSFX)
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