--- a/Makefile
+++ b/Makefile
@@ -13,3 +13,3 @@
 
-CFLAGS+=-I. -Wall -W -Wno-implicit-fallthrough -O3 -fsigned-char
+CFLAGS+=-I. -Wall -W -Wno-implicit-fallthrough -fsigned-char
 ifneq ($(findstring clang,$(CC)),clang)
@@ -21,3 +21,2 @@
 # ld: warning: option -s is obsolete and being ignored
-LDFLAGS+=-s
 endif
--- a/backup/libcd64/Makefile
+++ b/backup/libcd64/Makefile
@@ -1,3 +1,2 @@
 ifeq ($(CC),cc)
-CC=gcc
 endif
@@ -12,5 +11,3 @@
 else
-CFLAGS+=-O3 -funroll-loops
 ifneq ($(findstring clang,$(CC)),clang)
-CFLAGS+=-fexpensive-optimizations
 endif
--- a/libdiscmage/Makefile.in
+++ b/libdiscmage/Makefile.in
@@ -37,3 +37,2 @@
 # /usr/bin/libtool: -static not specified, -s invalid
-LDFLAGS+=-s
 endif