--- a/configure.ac
+++ b/configure.ac
@@ -208,8 +208,6 @@
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_LANG_C
-ACX_CHECK_COMPILER_FLAG(g, [CFLAGS="$CFLAGS -g"])
-ACX_CHECK_COMPILER_FLAG(O2, [CFLAGS="$CFLAGS -O2"])
 AC_PROG_CC
 ACX_DEPFLAG
 ACX_DETERMINE_EXT_FLAGS_UNBOUND