--- ./save_Makefile.gcc	2022-03-28 00:39:42.000000000 +0100
+++ ./Makefile.gcc	2022-04-03 21:55:07.275504582 +0100
@@ -26,7 +26,7 @@
 # the DLL name should be changed from "zlib1.dll".
 
 STATICLIB = libz.a
-SHAREDLIB = zlib1.dll
+SHAREDLIB = libz-1.dll
 IMPLIB    = libz.dll.a
 
 #
@@ -38,7 +38,7 @@
 
 PREFIX =
 CC = $(PREFIX)gcc
-CFLAGS = $(LOC) -O3 -Wall
+CFLAGS = $(LOC) -Os -ffast-math -Wall
 
 AS = $(CC)
 ASFLAGS = $(LOC) -Wall