diff --git a/scripts/makefile.clang-asan b/scripts/makefile.clang-asan
deleted file mode 100644
index 0cab52f..0000000
--- a/scripts/makefile.clang-asan
+++ /dev/null
@@ -1,87 +0,0 @@
-# makefile for libpng using clang + address sanitizer (generic, static library)
-# Copyright (C) 2008, 2014 Glenn Randers-Pehrson
-# Copyright (C) 2000, 2014, 2019 Cosmin Truta
-# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-#
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Location of the zlib library and include files
-ZLIBINC = ../zlib
-ZLIBLIB = ../zlib
-
-# Compiler, linker, lib and other tools
-CC = clang
-LD = $(CC)
-AR_RC = ar rcs
-RANLIB = ranlib
-CP = cp
-RM_F = rm -f
-
-WARNMORE = -Wwrite-strings -Wpointer-arith -Wshadow \
-	-Wmissing-declarations -Wtraditional -Wcast-align \
-	-Wstrict-prototypes -Wmissing-prototypes # -Wconversion
-CPPFLAGS = -I$(ZLIBINC) # -DPNG_DEBUG=5
-CFLAGS = -W -Wall -O0 -g -fsanitize=address
-LDFLAGS = -L$(ZLIBLIB) -g -fsanitize=address
-LIBS = -lz -lm
-
-# File extensions
-EXEEXT =
-
-# Pre-built configuration
-# See scripts/pnglibconf.mak for more options
-PNGLIBCONF_H_PREBUILT = scripts/pnglibconf.h.prebuilt
-
-# Variables
-OBJS =  png.o pngerror.o pngget.o pngmem.o pngpread.o \
-	pngread.o pngrio.o pngrtran.o pngrutil.o pngset.o \
-	pngtrans.o pngwio.o pngwrite.o pngwtran.o pngwutil.o
-
-# Targets
-all: static
-
-pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
-	$(CP) $(PNGLIBCONF_H_PREBUILT) $@
-
-.c.o:
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
-
-static: libpng.a pngtest$(EXEEXT)
-
-shared:
-	@echo This is a generic makefile that cannot create shared libraries.
-	@echo Please use a configuration that is specific to your platform.
-	@false
-
-libpng.a: $(OBJS)
-	$(AR_RC) $@ $(OBJS)
-	$(RANLIB) $@
-
-test: pngtest$(EXEEXT)
-	./pngtest$(EXEEXT)
-
-pngtest$(EXEEXT): pngtest.o libpng.a
-	$(LD) $(LDFLAGS) -o $@ pngtest.o libpng.a $(LIBS)
-
-clean:
-	$(RM_F) *.o libpng.a pngtest$(EXEEXT) pngout.png pnglibconf.h
-
-png.o:      png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngerror.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngget.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngmem.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngpread.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngread.o:  png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrio.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngset.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngtrans.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwio.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwrite.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-
-pngtest.o:  png.h pngconf.h pnglibconf.h
diff --git a/scripts/makefile.gcc-asan b/scripts/makefile.gcc-asan
deleted file mode 100644
index aae55d6..0000000
--- a/scripts/makefile.gcc-asan
+++ /dev/null
@@ -1,87 +0,0 @@
-# makefile for libpng using gcc + address sanitizer (generic, static library)
-# Copyright (C) 2008, 2014 Glenn Randers-Pehrson
-# Copyright (C) 2000, 2014, 2019 Cosmin Truta
-# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-#
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Location of the zlib library and include files
-ZLIBINC = ../zlib
-ZLIBLIB = ../zlib
-
-# Compiler, linker, lib and other tools
-CC = gcc
-LD = $(CC)
-AR_RC = ar rcs
-RANLIB = ranlib
-CP = cp
-RM_F = rm -f
-
-WARNMORE = -Wwrite-strings -Wpointer-arith -Wshadow \
-	-Wmissing-declarations -Wtraditional -Wcast-align \
-	-Wstrict-prototypes -Wmissing-prototypes # -Wconversion
-CPPFLAGS = -I$(ZLIBINC) # -DPNG_DEBUG=5
-CFLAGS = -W -Wall -O0 -g -fsanitize=address
-LDFLAGS = -L$(ZLIBLIB) -g -fsanitize=address
-LIBS = -lz -lm
-
-# File extensions
-EXEEXT =
-
-# Pre-built configuration
-# See scripts/pnglibconf.mak for more options
-PNGLIBCONF_H_PREBUILT = scripts/pnglibconf.h.prebuilt
-
-# Variables
-OBJS =  png.o pngerror.o pngget.o pngmem.o pngpread.o \
-	pngread.o pngrio.o pngrtran.o pngrutil.o pngset.o \
-	pngtrans.o pngwio.o pngwrite.o pngwtran.o pngwutil.o
-
-# Targets
-all: static
-
-pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
-	$(CP) $(PNGLIBCONF_H_PREBUILT) $@
-
-.c.o:
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
-
-static: libpng.a pngtest$(EXEEXT)
-
-shared:
-	@echo This is a generic makefile that cannot create shared libraries.
-	@echo Please use a configuration that is specific to your platform.
-	@false
-
-libpng.a: $(OBJS)
-	$(AR_RC) $@ $(OBJS)
-	$(RANLIB) $@
-
-test: pngtest$(EXEEXT)
-	./pngtest$(EXEEXT)
-
-pngtest$(EXEEXT): pngtest.o libpng.a
-	$(LD) $(LDFLAGS) -o $@ pngtest.o libpng.a $(LIBS)
-
-clean:
-	$(RM_F) *.o libpng.a pngtest$(EXEEXT) pngout.png pnglibconf.h
-
-png.o:      png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngerror.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngget.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngmem.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngpread.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngread.o:  png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrio.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngrutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngset.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngtrans.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwio.o:   png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwrite.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwtran.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-pngwutil.o: png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-
-pngtest.o:  png.h pngconf.h pnglibconf.h