diff --git a/build/filemgr.py b/build/filemgr.py
index 2ff163f0..99f4ca30 100644
--- a/build/filemgr.py
+++ b/build/filemgr.py
@@ -24,6 +24,7 @@ bpl_exa + "/getting_started1.cpp",
 bpl_exa + "/getting_started2.cpp",
 bpl_exa + "/simple_vector.cpp",
 bpl_exa + "/do_it_yourself_convts.cpp",
+bpl_exa + "/nested.cpp",
 bpl_exa + "/pickle1.cpp",
 bpl_exa + "/pickle2.cpp",
 bpl_exa + "/pickle3.cpp",
@@ -32,6 +33,7 @@ bpl_exa + "/test_getting_started1.py",
 bpl_exa + "/test_getting_started2.py",
 bpl_exa + "/test_simple_vector.py",
 bpl_exa + "/test_do_it_yourself_convts.py",
+bpl_exa + "/test_nested.py",
 bpl_exa + "/test_pickle1.py",
 bpl_exa + "/test_pickle2.py",
 bpl_exa + "/test_pickle3.py",
@@ -68,6 +70,7 @@ defs = (
 "getting_started2",
 "simple_vector",
 "do_it_yourself_convts",
+"nested",
 "pickle1",
 "pickle2",
 "pickle3",
diff --git a/build/irix_CC.mak b/build/irix_CC.mak
index 6e465b98..e3a97781 100644
--- a/build/irix_CC.mak
+++ b/build/irix_CC.mak
@@ -44,6 +44,7 @@ DEPOBJ=$(OBJ) \
        getting_started1.o getting_started2.o \
        simple_vector.o \
        do_it_yourself_convts.o \
+       nested.o \
        pickle1.o pickle2.o pickle3.o \
        noncopyable_export.o noncopyable_import.o \
        ivect.o dvect.o \
@@ -57,6 +58,7 @@ all: libboost_python.a \
      getting_started1.so getting_started2.so \
      simple_vector.so \
      do_it_yourself_convts.so \
+     nested.so \
      pickle1.so pickle2.so pickle3.so \
      noncopyable_export.so noncopyable_import.so \
      ivect.so dvect.so \
@@ -84,6 +86,9 @@ simple_vector.so: $(OBJ) simple_vector.o
 do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
 	$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
 
+nested.so: $(OBJ) nested.o
+	$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
+
 pickle1.so: $(OBJ) pickle1.o
 	$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
 
@@ -126,6 +131,7 @@ test:
 	$(PYEXE) test_getting_started2.py
 	$(PYEXE) test_simple_vector.py
 	$(PYEXE) test_do_it_yourself_convts.py
+	$(PYEXE) test_nested.py
 	$(PYEXE) test_pickle1.py
 	$(PYEXE) test_pickle2.py
 	$(PYEXE) test_pickle3.py
@@ -142,6 +148,7 @@ clean:
 	rm -f getting_started2.o getting_started2.so
 	rm -f simple_vector.o simple_vector.so
 	rm -f do_it_yourself_convts.o do_it_yourself_convts.so
+	rm -f nested.o nested.so
 	rm -f pickle1.o pickle1.so
 	rm -f pickle2.o pickle2.so
 	rm -f pickle3.o pickle3.so
diff --git a/build/linux_gcc.mak b/build/linux_gcc.mak
index 2c977473..64d61bab 100644
--- a/build/linux_gcc.mak
+++ b/build/linux_gcc.mak
@@ -45,6 +45,7 @@ DEPOBJ=$(OBJ) \
        getting_started1.o getting_started2.o \
        simple_vector.o \
        do_it_yourself_convts.o \
+       nested.o \
        pickle1.o pickle2.o pickle3.o \
        noncopyable_export.o noncopyable_import.o \
        ivect.o dvect.o \
@@ -58,6 +59,7 @@ all: libboost_python.a \
      getting_started1.so getting_started2.so \
      simple_vector.so \
      do_it_yourself_convts.so \
+     nested.so \
      pickle1.so pickle2.so pickle3.so \
      noncopyable_export.so noncopyable_import.so \
      ivect.so dvect.so \
@@ -85,6 +87,9 @@ simple_vector.so: $(OBJ) simple_vector.o
 do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
 	$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
 
+nested.so: $(OBJ) nested.o
+	$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
+
 pickle1.so: $(OBJ) pickle1.o
 	$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
 
@@ -127,6 +132,7 @@ test:
 	$(PYEXE) test_getting_started2.py
 	$(PYEXE) test_simple_vector.py
 	$(PYEXE) test_do_it_yourself_convts.py
+	$(PYEXE) test_nested.py
 	$(PYEXE) test_pickle1.py
 	$(PYEXE) test_pickle2.py
 	$(PYEXE) test_pickle3.py
@@ -143,6 +149,7 @@ clean:
 	rm -f getting_started2.o getting_started2.so
 	rm -f simple_vector.o simple_vector.so
 	rm -f do_it_yourself_convts.o do_it_yourself_convts.so
+	rm -f nested.o nested.so
 	rm -f pickle1.o pickle1.so
 	rm -f pickle2.o pickle2.so
 	rm -f pickle3.o pickle3.so
diff --git a/build/mingw32.mak b/build/mingw32.mak
index e966f48a..bf590409 100644
--- a/build/mingw32.mak
+++ b/build/mingw32.mak
@@ -30,13 +30,16 @@
 # -fvtable-thunks eliminates the compiler warning, but
 #                 "import boost_python_test" still causes a crash.
 
-ROOT=L:
+ROOT=R:
 BOOST_WIN="$(ROOT)\boost"
 BOOST_UNIX=$(HOME)/boost
 
 PYEXE="C:\Program files\Python\python.exe"
 PYINC=-I"C:\usr\include\python1.5"
 PYLIB="C:\usr\lib\libpython15.a"
+#PYEXE="C:\Python21\python.exe"
+#PYINC=-I"C:\usr\include\python2.1"
+#PYLIB="C:\usr\lib\libpython21.a"
 
 STDOPTS=-ftemplate-depth-21
 WARNOPTS=
@@ -60,6 +63,7 @@ all: libboost_python.a \
      getting_started1.pyd getting_started2.pyd \
      simple_vector.pyd \
      do_it_yourself_convts.pyd \
+     nested.pyd \
      pickle1.pyd pickle2.pyd pickle3.pyd \
      noncopyable_export.pyd noncopyable_import.pyd \
      ivect.pyd dvect.pyd \
@@ -108,6 +112,12 @@ do_it_yourself_convts.pyd: $(OBJ) do_it_yourself_convts.o
           --def do_it_yourself_convts.def \
           $(OBJ) do_it_yourself_convts.o $(PYLIB)
 
+nested.pyd: $(OBJ) nested.o
+	dllwrap $(DLLWRAPOPTS) \
+          --dllname nested.pyd \
+          --def nested.def \
+          $(OBJ) nested.o $(PYLIB)
+
 pickle1.pyd: $(OBJ) pickle1.o
 	dllwrap $(DLLWRAPOPTS) \
           --dllname pickle1.pyd \
@@ -178,6 +188,7 @@ test:
 	$(PYEXE) test_getting_started2.py
 	$(PYEXE) test_simple_vector.py
 	$(PYEXE) test_do_it_yourself_convts.py
+	$(PYEXE) test_nested.py
 	$(PYEXE) test_pickle1.py
 	$(PYEXE) test_pickle2.py
 	$(PYEXE) test_pickle3.py
diff --git a/build/tru64_cxx.mak b/build/tru64_cxx.mak
index fba2bfe1..d06f3372 100644
--- a/build/tru64_cxx.mak
+++ b/build/tru64_cxx.mak
@@ -55,6 +55,7 @@ DEPOBJ=$(OBJ) \
        getting_started1.o getting_started2.o \
        simple_vector.o \
        do_it_yourself_convts.o \
+       nested.o \
        pickle1.o pickle2.o pickle3.o \
        noncopyable_export.o noncopyable_import.o \
        ivect.o dvect.o \
@@ -68,6 +69,7 @@ all: libboost_python.a \
      getting_started1.so getting_started2.so \
      simple_vector.so \
      do_it_yourself_convts.so \
+     nested.so \
      pickle1.so pickle2.so pickle3.so \
      noncopyable_export.so noncopyable_import.so \
      ivect.so dvect.so \
@@ -99,6 +101,9 @@ simple_vector.so: $(OBJ) simple_vector.o
 do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
 	$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
 
+nested.so: $(OBJ) nested.o
+	$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
+
 pickle1.so: $(OBJ) pickle1.o
 	$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
 
@@ -141,6 +146,7 @@ test:
 	$(PYEXE) test_getting_started2.py
 	$(PYEXE) test_simple_vector.py
 	$(PYEXE) test_do_it_yourself_convts.py
+	$(PYEXE) test_nested.py
 	$(PYEXE) test_pickle1.py
 	$(PYEXE) test_pickle2.py
 	$(PYEXE) test_pickle3.py
@@ -157,6 +163,7 @@ clean:
 	rm -f getting_started2.o getting_started2.so
 	rm -f simple_vector.o simple_vector.so
 	rm -f do_it_yourself_convts.o do_it_yourself_convts.so
+	rm -f nested.o nested.so
 	rm -f pickle1.o pickle1.so
 	rm -f pickle2.o pickle2.so
 	rm -f pickle3.o pickle3.so
diff --git a/build/vc60.mak b/build/vc60.mak
index ae655c14..a348de54 100644
--- a/build/vc60.mak
+++ b/build/vc60.mak
@@ -10,7 +10,7 @@
 #   12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
 #   Initial version: R.W. Grosse-Kunstleve
 
-ROOT=L:
+ROOT=R:
 BOOST_WIN="$(ROOT)\boost"
 BOOST_UNIX=$(HOME)/boost
 
@@ -44,6 +44,7 @@ all: boost_python.lib \
      getting_started1.pyd getting_started2.pyd \
      simple_vector.pyd \
      do_it_yourself_convts.pyd \
+     nested.pyd \
      pickle1.pyd pickle2.pyd pickle3.pyd \
      noncopyable_export.pyd noncopyable_import.pyd \
      ivect.pyd dvect.pyd \
@@ -70,6 +71,9 @@ simple_vector.pyd: $(OBJ) simple_vector.obj
 do_it_yourself_convts.pyd: $(OBJ) do_it_yourself_convts.obj
 	$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.obj $(PYLIB) /export:initdo_it_yourself_convts /out:"do_it_yourself_convts.pyd"
 
+nested.pyd: $(OBJ) nested.obj
+	$(LD) $(LDOPTS) $(OBJ) nested.obj $(PYLIB) /export:initnested /out:"nested.pyd"
+
 pickle1.pyd: $(OBJ) pickle1.obj
 	$(LD) $(LDOPTS) $(OBJ) pickle1.obj $(PYLIB) /export:initpickle1 /out:"pickle1.pyd"
 
@@ -110,6 +114,7 @@ test:
 	$(PYEXE) test_getting_started2.py
 	$(PYEXE) test_simple_vector.py
 	$(PYEXE) test_do_it_yourself_convts.py
+	$(PYEXE) test_nested.py
 	$(PYEXE) test_pickle1.py
 	$(PYEXE) test_pickle2.py
 	$(PYEXE) test_pickle3.py
diff --git a/example/nested.cpp b/example/nested.cpp
new file mode 100644
index 00000000..543754f7
--- /dev/null
+++ b/example/nested.cpp
@@ -0,0 +1,44 @@
+// Example by Ralf W. Grosse-Kunstleve
+
+/*
+    This example shows how convert a nested Python tuple.
+ */
+
+#include <boost/python/class_builder.hpp>
+#include <stdio.h>
+
+namespace {
+
+  boost::python::list
+  show_nested_tuples(boost::python::tuple outer)
+  {
+    boost::python::list result;
+    for (int i = 0; i < outer.size(); i++) {
+      boost::python::tuple inner(
+        BOOST_PYTHON_CONVERSION::from_python(outer[i].get(),
+        boost::python::type<boost::python::tuple>()));
+      for (int j = 0; j < inner.size(); j++) {
+        double x = BOOST_PYTHON_CONVERSION::from_python(inner[j].get(),
+          boost::python::type<double>());
+        char buf[128];
+        sprintf(buf, "(%d,%d) %.6g", i, j, x);
+        result.append(BOOST_PYTHON_CONVERSION::to_python(std::string(buf)));
+      }
+    }
+    return result;
+  }
+
+}
+
+BOOST_PYTHON_MODULE_INIT(nested)
+{
+  try
+  {
+    boost::python::module_builder this_module("nested");
+    this_module.def(show_nested_tuples, "show_nested_tuples");
+  }
+  catch(...)
+  {
+    boost::python::handle_exception();
+  }
+}
diff --git a/example/test_nested.py b/example/test_nested.py
new file mode 100644
index 00000000..e9abbf0f
--- /dev/null
+++ b/example/test_nested.py
@@ -0,0 +1,23 @@
+r'''>>> import nested
+    >>> s = nested.show_nested_tuples(((1,2,3), (4,5,6,7)))
+    >>> for l in s:
+    ...   print l
+    (0,0) 1
+    (0,1) 2
+    (0,2) 3
+    (1,0) 4
+    (1,1) 5
+    (1,2) 6
+    (1,3) 7
+'''
+
+def run(args = None):
+    if args is not None:
+        import sys
+        sys.argv = args
+    import doctest, test_nested
+    return doctest.testmod(test_nested)
+
+if __name__ == '__main__':
+    import sys
+    sys.exit(run()[0])