--- a/configure.ac
+++ b/configure.ac
@@ -69,29 +69,6 @@
 dnl Check for AIX
 AC_AIX
 
-CFLAGS="$CFLAGS -g -Wall -D_REENTRANT"
-
-if test x$debug = xtrue; then
-   CFLAGS="$CFLAGS -O0 -DDEBUG"
-else
-  if test -n "$auto_cflags"; then
-    if test -n "$GCC"; then
-      CFLAGS="$CFLAGS -g -O2 -Wall -Wno-implicit"
-    else
-      case "$host_os" in
-        *hpux*)  CFLAGS="$CFLAGS +O3"
-	  ;;
-        *ultrix* | *osf*) CFLAGS="$CFLAGS -O -Olimit 2000"
-	  ;;
-        *)       CFLAGS="$CFLAGS -O2"
-	  ;;
-      esac
-    fi
-  else
-    CFLAGS="$CFLAGS -O2"
-  fi
-fi
-
 case "$CC" in
 	gcc*|clang*) CFLAGS="$CFLAGS -std=gnu89"
 	;;