diff -Nru ntl-5.5.2/debian/changelog ntl-5.5.2/debian/changelog
--- ntl-5.5.2/debian/changelog	2012-02-11 13:04:13.000000000 +0000
+++ ntl-5.5.2/debian/changelog	2012-05-15 10:12:31.000000000 +0000
@@ -1,3 +1,11 @@
+ntl (5.5.2-2) unstable; urgency=low
+
+  * add more optional symbols to avoid
+    failure with g++-4.7 (Closes: 667300)
+  * increase Standards-Version
+
+ -- Bernhard R. Link <brlink@debian.org>  Tue, 15 May 2012 11:46:08 +0200
+
 ntl (5.5.2-1) unstable; urgency=low
 
   * this is still a preview, but most likely already complete
diff -Nru ntl-5.5.2/debian/control ntl-5.5.2/debian/control
--- ntl-5.5.2/debian/control	2012-02-11 13:03:40.000000000 +0000
+++ ntl-5.5.2/debian/control	2012-05-15 09:45:46.000000000 +0000
@@ -5,7 +5,7 @@
 Uploaders: Bernhard R. Link <brlink@debian.org>, Lifeng Sun <lifongsun@gmail.com>, Felix Salfelder <felix@salfelder.org>
 Build-Depends: debhelper (>= 8.1.3), libtool, libgmp-dev
 Homepage: http://www.shoup.net/ntl/
-Standards-Version: 3.9.2
+Standards-Version: 3.9.3
 Vcs-Browser: http://git.debian.org/?p=debian-science/packages/libntl.git
 Vcs-Git: git://git.debian.org/git/debian-science/packages/libntl.git
 
diff -Nru ntl-5.5.2/debian/.git-dpm ntl-5.5.2/debian/.git-dpm
--- ntl-5.5.2/debian/.git-dpm	1970-01-01 00:00:00.000000000 +0000
+++ ntl-5.5.2/debian/.git-dpm	2012-02-11 19:46:28.000000000 +0000
@@ -0,0 +1,8 @@
+# see git-dpm(1) from git-dpm package
+0f2b338f9fafa054732b30a3296eb93262b53645
+0f2b338f9fafa054732b30a3296eb93262b53645
+234ecb0054229e0458d9bfaa3c8672e84ff8f477
+234ecb0054229e0458d9bfaa3c8672e84ff8f477
+ntl_5.5.2.orig.tar.gz
+b45e3858f7f351afeb7fbb831b256befc4892b06
+707247
diff -Nru ntl-5.5.2/debian/libntl0.symbols ntl-5.5.2/debian/libntl0.symbols
--- ntl-5.5.2/debian/libntl0.symbols	2012-02-11 18:36:52.000000000 +0000
+++ ntl-5.5.2/debian/libntl0.symbols	2012-05-14 18:50:49.000000000 +0000
@@ -1143,7 +1143,7 @@
  (c++)"NTL::rem(NTL::zz_pEX&, NTL::zz_pEX const&, NTL::zz_pEX const&)@Base" 0
  (c++)"NTL::set(NTL::RR&)@Base" 0
  (c++)"NTL::set(NTL::GF2X&)@Base" 0
- (c++)"NTL::set(NTL::ZZ_pX&)@Base" 0
+ (c++|optional)"NTL::set(NTL::ZZ_pX&)@Base" 0
  (c++)"NTL::sin(NTL::RR&, NTL::RR const&)@Base" 0
  (c++)"NTL::sqr(NTL::RR&, NTL::RR const&)@Base" 0
  (c++)"NTL::sqr(NTL::ZZX&, NTL::ZZX const&)@Base" 0
@@ -3068,3 +3068,48 @@
  _ntl_gzero@Base 0
  _ntl_ldexp@Base 0
  _ntl_ldexp_zero@Base 0
+ (c++|optional)"NTL::LocalInfoT::~LocalInfoT()@Base" 5.5.2-2~
+ (c++|optional)"NTL::LocalInfoT::~LocalInfoT()@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pXMatrix::~ZZ_pXMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pXMatrix::~ZZ_pXMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::zz_pXMatrix::~zz_pXMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::zz_pXMatrix::~zz_pXMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::GF2EXArgument::~GF2EXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::GF2EXArgument::~GF2EXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pEXArgument::~ZZ_pEXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pEXArgument::~ZZ_pEXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::zz_pEXArgument::~zz_pEXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::zz_pEXArgument::~zz_pEXArgument()@Base" 5.5.2-2~
+ (c++|optional)"NTL::_NTL_GF2XMatrix::~_NTL_GF2XMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::_NTL_GF2XMatrix::~_NTL_GF2XMatrix()@Base" 5.5.2-2~
+ (c++|optional)"NTL::GF2XRegisterType::~GF2XRegisterType()@Base" 5.5.2-2~
+ (c++|optional)"NTL::GF2XRegisterType::~GF2XRegisterType()@Base" 5.5.2-2~
+ (c++|optional)"NTL::RR::operator=(NTL::RR const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ::operator=(NTL::ZZ const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::exp(NTL::RR const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::log(NTL::RR const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::GF2EX::operator=(NTL::GF2EX const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pX::operator=(NTL::ZZ_pX const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::ZZ_pEX::operator=(NTL::ZZ_pEX const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_RR::~mat_RR()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_RR::~mat_RR()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ::~mat_ZZ()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ::~mat_ZZ()@Base" 5.5.2-2~
+ (c++|optional)"NTL::zz_pEX::operator=(NTL::zz_pEX const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_GF2::~mat_GF2()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_GF2::~mat_GF2()@Base" 5.5.2-2~
+ (c++|optional)"NTL::vec_GF2::~vec_GF2()@Base" 5.5.2-2~
+ (c++|optional)"NTL::vec_GF2::~vec_GF2()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_GF2E::~mat_GF2E()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_GF2E::~mat_GF2E()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ_p::~mat_ZZ_p()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ_p::~mat_ZZ_p()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_zz_p::~mat_zz_p()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_zz_p::~mat_zz_p()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ_pE::~mat_ZZ_pE()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_ZZ_pE::~mat_ZZ_pE()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_zz_pE::~mat_zz_pE()@Base" 5.5.2-2~
+ (c++|optional)"NTL::mat_zz_pE::~mat_zz_pE()@Base" 5.5.2-2~
+ (c++|optional)"NTL::operator/(NTL::RR const&, double)@Base" 5.5.2-2~
+ (c++|optional)"NTL::operator*(NTL::RR const&, NTL::RR const&)@Base" 5.5.2-2~
+ (c++|optional)"NTL::operator*(double, NTL::RR const&)@Base" 5.5.2-2~