curl/types.h was removed in 
https://github.com/bagder/curl/commit/2ef7a28a71f819343afefa721e5497119fb2cee0#include/curl
and is not available in curl-7.21.8 and newer

diff -uNr tangogps-0.99.4.orig//src/util.h tangogps-0.99.4/src/util.h
--- tangogps-0.99.4.orig//src/util.h	2009-11-06 13:16:05.000000000 +0100
+++ tangogps-0.99.4/src/util.h	2011-07-21 14:36:59.208792227 +0200
@@ -2,7 +2,6 @@
 #include <gtk/gtk.h>
 
 #include <curl/curl.h>
-#include <curl/types.h>
 #include <curl/easy.h>
 int
 sql_execute(char *db_name, char *sql, int (*cb_func)(void*,int,char**,char**));
diff -uNr tangogps-0.99.4.orig//src/friends.c tangogps-0.99.4/src/friends.c
--- tangogps-0.99.4.orig//src/friends.c	2010-06-25 11:40:04.000000000 +0200
+++ tangogps-0.99.4/src/friends.c	2011-07-21 14:39:14.711789408 +0200
@@ -17,7 +17,6 @@
 #include <gtk/gtk.h>
 
 #include <curl/curl.h>
-#include <curl/types.h>
 #include <curl/easy.h>
 
 
diff -uNr tangogps-0.99.4.orig//src/tile_management.c tangogps-0.99.4/src/tile_management.c
--- tangogps-0.99.4.orig//src/tile_management.c	2010-06-25 11:40:05.000000000 +0200
+++ tangogps-0.99.4/src/tile_management.c	2011-07-21 14:38:45.030790011 +0200
@@ -5,7 +5,6 @@
 #include <glib/gprintf.h>
 #include <string.h>
 #include <curl/curl.h>
-#include <curl/types.h> 
 #include <curl/easy.h> 
 #include <math.h>
 #include "globals.h"