--- a/Makefile.in
+++ b/Makefile.in
@@ -25,8 +25,8 @@
 INSTALL = @INSTALL@
 DEFS = @DEFS@
 LIBS = @LIBS@
-CFLAGS = -O
-LDFLAGS = -s
+CFLAGS +=
+LDFLAGS +=
 prefix = @prefix@
 
 SHELL = /bin/sh