[squid-users] Squid Compilation Error on Ubuntu for squid-3.HEAD

I am trying to build squid-3.HEAD on Ubuntu 11 but i am getting the
following compilation errors.

/bin/bash ../../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H
 -I../.. -I../../include -I../../lib -I../../src -I../../include
-I../../libltdl -Wall -Wpointer-arith -Wwrite-strings -Wcomments
-Werror -pipe -D_REENTRANT -g -O2 -std=c++0x -MT Acl.lo -MD -MP -MF
.deps/Acl.Tpo -c -o Acl.lo Acl.cc
libtool: compile: g++ -DHAVE_CONFIG_H -I../.. -I../../include
-I../../lib -I../../src -I../../include -I../../libltdl -Wall
-Wpointer-arith -Wwrite-strings -Wcomments -Werror -pipe -D_REENTRANT
-g -O2 -std=c++0x -MT Acl.lo -MD -MP -MF .deps/Acl.Tpo -c Acl.cc
-fPIC -DPIC -o .libs/Acl.o
In file included from ../../src/ProtoPort.h:12:0,
                 from Acl.cc:40:

/src/ssl/gadgets.h:57:1: error: variable or field 'TXT_DB_free_cpp'
declared void
../../src/ssl/gadgets.h:57:1: error: 'TXT_DB' was not declared in this scope
../../src/ssl/gadgets.h:57:1: error: 'a' was not declared in this scope
../../src/ssl/gadgets.h:58:21: error: 'TXT_DB' was not declared in this scope
../../src/ssl/gadgets.h:58:29: error: 'TXT_DB_free_cpp' was not
declared in this scope
../../src/ssl/gadgets.h:58:44: error: template argument 1 is invalid
../../src/ssl/gadgets.h:58:44: error: template argument 2 is invalid
../../src/ssl/gadgets.h:58:60: error: invalid type in declaration
before ';' token

The version for open-ssl is "1.0.0e-2ubuntu4.6"(latest) and gcc is "4:4.6.1".

What can be the issue and how to resolve it.

-- 
Regards,
-Ahmed Talha Khan