Try requiring libltdl-devel instead. Really should be using the system ltdl

anyway

squid-3.1.5-libtoolinclude.patch

@@ -1,16 +0,0 @@
-diff -ru squid-3.1.5/libltdl/ltdl.h squid-3.1.5-libtool-fixed/libltdl/ltdl.h
---- squid-3.1.5/libltdl/ltdl.h	2010-07-02 04:47:56.000000000 +0200
-+++ squid-3.1.5-libtool-fixed/libltdl/ltdl.h	2010-07-15 13:10:27.000000000 +0200
-@@ -33,9 +33,9 @@
- #if !defined(LTDL_H)
- #define LTDL_H 1
- 
--#include <libltdl/lt_system.h>
--#include <libltdl/lt_error.h>
--#include <libltdl/lt_dlloader.h>
-+#include "libltdl/lt_system.h"
-+#include "libltdl/lt_error.h"
-+#include "libltdl/lt_dlloader.h"
- 
- LT_BEGIN_C_DECLS
- 

squid.spec

@@ -35,10 +35,6 @@ Patch204: squid-3.0.STABLE1-perlpath.patch
 Patch205: squid-3.1.0.15-smb-path.patch
 Patch208: squid-3.0.STABLE7-from_manpg.patch
 
-# Temporary patches
-# 3.1.5 bundles a slightly broken libtool. Fixed upstream.
-Patch301: squid-3.1.5-libtoolinclude.patch
-
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires: bash >= 2.0
 Requires(pre): shadow-utils
@@ -59,6 +55,8 @@ BuildRequires: db4-devel
 BuildRequires: expat-devel libxml2-devel
 # TPROXY requires libcap, and also increases security somewhat
 BuildRequires: libcap-devel
+# eCAP and some other need libltdl
+BuildRequires: libtool-ltdl-devel
 
 %description
 Squid is a high-performance proxy caching server for Web clients,
@@ -87,8 +85,6 @@ lookup program (dnsserver), a program for retrieving FTP data
 %patch205 -p1 -b .smb-path
 %patch208 -p1 -b .from_manpg
 
-%patch301 -p1 -b .libtoolinclude
-
 %build
 
 %configure \