--- quake2-xatrix-2.06.orig/Makefile	2019-02-05 10:56:06.000000000 +0300
+++ quake2-xatrix-2.06/Makefile	2019-04-08 01:24:04.124176498 +0300
@@ -75,11 +75,11 @@
 #
 # -MMD to generate header dependencies.
 ifeq ($(OSTYPE), Darwin)
-CFLAGS := -O2 -fno-strict-aliasing -fomit-frame-pointer \
-		  -Wall -pipe -g -fwrapv -arch i386 -arch x86_64
+CFLAGS += -fno-strict-aliasing -fomit-frame-pointer \
+		  -Wall -fwrapv -arch i386 -arch x86_64
 else
-CFLAGS := -std=gnu99 -O2 -fno-strict-aliasing -fomit-frame-pointer \
-		  -Wall -pipe -g -MMD -fwrapv
+CFLAGS += -std=gnu99 -fno-strict-aliasing -fomit-frame-pointer \
+		  -Wall -MMD -fwrapv
 endif
 
 # ----------
@@ -107,11 +107,11 @@
 
 # Base LDFLAGS.
 ifeq ($(OSTYPE), Darwin)
-LDFLAGS := -shared -arch i386 -arch x86_64
+LDFLAGS += -shared -arch i386 -arch x86_64
 else ifeq ($(OSTYPE), Windows)
-LDFLAGS := -shared -static-libgcc
+LDFLAGS += -shared -static-libgcc
 else
-LDFLAGS := -shared -lm
+LDFLAGS += -shared -lm
 endif
 
 # ----------