diff --git a/configure b/configure
index 8ebfe73..edd2934 100755
--- a/configure
+++ b/configure
@@ -11561,6 +11561,13 @@ CC="$lt_save_CC"
 
 
 
+# Add -Wall -Werror if we are using GCC.
+# We also need -Wno-deprecated-declarations, primarily because on MacOS, daemon(3)
+# is deprecated starting from MacOS 10.5.
+if test "x$GCC" = "xyes"; then
+  CFLAGS="$CFLAGS -Wall -Werror -Wno-deprecated-declarations"
+fi
+
 # Checks for header files.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }