diff -up glibmm-2.56.0/tools/extra_defs_gen/generate_extra_defs.cc.no-regex-replace glibmm-2.56.0/tools/extra_defs_gen/generate_extra_defs.cc
--- glibmm-2.56.0/tools/extra_defs_gen/generate_extra_defs.cc.no-regex-replace	2018-06-09 12:23:09.263360049 -0400
+++ glibmm-2.56.0/tools/extra_defs_gen/generate_extra_defs.cc	2018-06-09 12:42:26.490317489 -0400
@@ -36,6 +36,25 @@ void add_signal_flag_if(std::string& str
 
 } // anonymous namespace
 
+static std::string
+string_replace (const char *input,
+                const char *old_token,
+                const char *new_token)
+{
+  char **split_string;
+  char *c_output;
+  std::string output;
+
+  split_string = g_strsplit (input, old_token, -1);
+  c_output = g_strjoinv (new_token, split_string);
+  g_strfreev (split_string);
+
+  output = c_output;
+  g_free (c_output);
+
+  return output;
+}
+
 std::string
 get_property_with_node_name(
   GParamSpec* pParamSpec, const std::string& strObjectName, const std::string& strNodeName)
@@ -87,7 +106,7 @@ get_property_with_node_name(
       // Replace newlines with \n.
       // A string default value can contain newline characters.
       // gmmproc removes all newlines when it reads .defs files.
-      defString = std::regex_replace(defCString, std::regex("\n"), "\\n");
+      defString = string_replace (defCString, "\n", "\\n");
     }
     else
       defString = ""; // A NULL string pointer becomes an empty string.