Add LM_ prefix to message_type_t enum values.

diff --git a/src/lingot-gui-mainframe.c b/src/lingot-gui-mainframe.c
index 30c1b69..8380406 100644
--- a/src/lingot-gui-mainframe.c
+++ b/src/lingot-gui-mainframe.c
@@ -240,12 +240,12 @@ gboolean lingot_gui_mainframe_callback_error_dispatcher(gpointer data) {
 											!= NULL) ? frame->config_dialog->win : frame->win),
 							GTK_DIALOG_DESTROY_WITH_PARENT,
 							(message_type == ERROR) ? GTK_MESSAGE_ERROR
-									: ((message_type == WARNING) ? GTK_MESSAGE_WARNING
+									: ((message_type == LM_WARNING) ? GTK_MESSAGE_WARNING
 											: GTK_MESSAGE_INFO),
 							GTK_BUTTONS_CLOSE, error_message);
 			gtk_window_set_title(GTK_WINDOW(message_dialog), (message_type
 					== ERROR) ? _("Error")
-					: ((message_type == WARNING) ? _("Warning") : _("Info")));
+					: ((message_type == LM_WARNING) ? _("Warning") : _("Info")));
 			gtk_window_set_icon(GTK_WINDOW(message_dialog),
 					gtk_window_get_icon(GTK_WINDOW(frame->win)));
 			gtk_dialog_run(GTK_DIALOG(message_dialog));
diff --git a/src/lingot-msg.c b/src/lingot-msg.c
index 8cd8864..9e738d8 100644
--- a/src/lingot-msg.c
+++ b/src/lingot-msg.c
@@ -36,15 +36,15 @@ int front = 0, rear = 0;
 pthread_mutex_t message_queue_mutex = PTHREAD_MUTEX_INITIALIZER;

 void lingot_msg_add_error(const char* msg) {
-	lingot_msg_add(msg, ERROR);
+	lingot_msg_add(msg, LM_ERROR);
 }

 void lingot_msg_add_warning(const char* msg) {
-	lingot_msg_add(msg, WARNING);
+	lingot_msg_add(msg, LM_WARNING);
 }

 void lingot_msg_add_info(const char* msg) {
-	lingot_msg_add(msg, INFO);
+	lingot_msg_add(msg, LM_INFO);
 }

 void lingot_msg_add(const char* msg, message_type_t type) {
diff --git a/src/lingot-msg.h b/src/lingot-msg.h
index 6e28964..d100683 100644
--- a/src/lingot-msg.h
+++ b/src/lingot-msg.h
@@ -27,7 +27,7 @@

 // message types
 typedef enum message_type_t {
-	ERROR = 0, WARNING = 1, INFO = 2
+	LM_ERROR = 0, LM_WARNING = 1, LM_INFO = 2
 } message_type_t;

 // add messages to the queue