---- libpng-1.5.7/contrib/pngminus/makefile.std.orig 2011-12-15 16:45:32.000000000 +0100
-+++ libpng-1.5.7/contrib/pngminus/makefile.std 2011-12-18 16:24:38.099367091 +0100
-@@ -12,20 +12,20 @@
- #PNGLIB = -L$(PNGPATH)/lib -lpng15
- #PNGLIBS = $(PNGPATH)/lib/libpng15.a
+--- libpng-1.6.37/contrib/pngminus/Makefile~ 2019-04-14 20:10:32.000000000 +0200
++++ libpng-1.6.37/contrib/pngminus/Makefile 2019-04-23 09:25:47.422459927 +0200
+@@ -8,7 +8,7 @@
+ RM = rm -f
+
PNGINC = -I../..
--PNGLIB = -L../.. -lpng
-+PNGLIB = -L../.. -L../../.libs -lpng15
- PNGLIBS = ../../libpng.a
+-PNGLIB_SHARED = -L../.. -lpng
++PNGLIB_SHARED = -L../.. -L../../.libs/ -lpng16
+ PNGLIB_STATIC = ../../libpng.a
+
+ # Uncomment the following if you have a custom zlib build at ../../../zlib
+@@ -20,10 +20,10 @@
+ ZLIB_SHARED = -lz
+ ZLIB_STATIC = -lz
- #ZPATH = /usr/local
- #ZINC = -I$(ZPATH)/include
- #ZLIB = -L$(ZPATH)/lib -lz
- #ZLIBS = $(ZPATH)/lib/libz.a
--ZINC = -I../../../zlib
--ZLIB = -L../../../zlib -lz
--ZLIBS = ../../../zlib/libz.a
-+ZINC =
-+ZLIB = -lz
-+ZLIBS = -lz
+-CPPFLAGS = $(PNGINC) $(ZINC)
++CPPFLAGS = $(OPT_FLAGS) $(PNGINC) $(ZINC)
+ CFLAGS =
+ LDFLAGS =
+-LIBS_SHARED = $(PNGLIB_SHARED) $(ZLIB_SHARED)
++LIBS_SHARED = $(LD_FLAGS) $(PNGLIB_SHARED) $(ZLIB_SHARED)
+ LIBS_STATIC = $(PNGLIB_STATIC) $(ZLIB_STATIC)
--CFLAGS=$(PNGINC) $(ZINC)
-+CFLAGS=$(OPT_FLAGS) $(PNGINC) $(ZINC)
- LDLIBS=$(PNGLIB) $(ZLIB)
--LDLIBSS=$(PNGLIBS) $(ZLIBS)
-+LDLIBSS=$(LD_FLAGS) $(PNGLIBS) $(ZLIBS)
- C=.c
- O=.o
- L=.a
-@@ -33,8 +33,7 @@
+ EXEEXT =
+@@ -31,7 +31,7 @@
# dependencies
--#all: png2pnm$(E) pnm2png$(E)
--all: png2pnm$(E) pnm2png$(E) png2pnm-static$(E) pnm2png-static$(E)
-+all: png2pnm$(E) pnm2png$(E)
+-all: png2pnm$(EXEEXT) pnm2png$(EXEEXT) png2pnm-static$(EXEEXT) pnm2png-static$(EXEEXT)
++all: png2pnm$(EXEEXT) pnm2png$(EXEEXT)
- png2pnm$(O): png2pnm$(C)
- $(CC) -c $(CFLAGS) png2pnm$(C)
+ png2pnm.o: png2pnm.c
+ $(CC) -c $(CPPFLAGS) $(CFLAGS) png2pnm.c