error: 'to_string' is not a member of 'std' (on Cygwin)

After 2e15c552, I get the following error when building DOLFIN on Cygwin:

...
2014/09/09 20:33:46 - INFO: [package:run_job] [ 40%] Building CXX object dolfin/CMakeFiles/dolfin.dir/io/HDF5File.cpp.o
2014/09/09 20:33:50 - INFO: [package:run_job] /home/johannr/.hashdist/tmp/dolfin-m2db6rzykoso/dolfin/io/HDF5File.cpp: In member function 'void dolfin::HDF5File::write(const dol\
fin::Mesh&, std::size_t, std::string)':
2014/09/09 20:33:50 - INFO: [package:run_job] /home/johannr/.hashdist/tmp/dolfin-m2db6rzykoso/dolfin/io/HDF5File.cpp:395:63: error: 'to_string' is not a member of 'std'
2014/09/09 20:33:50 - INFO: [package:run_job]        const std::string marker_dataset =  name + "/domain_" + std::to_string(d);
2014/09/09 20:33:50 - INFO: [package:run_job]                                                                ^
2014/09/09 20:33:50 - INFO: [package:run_job] /home/johannr/.hashdist/tmp/dolfin-m2db6rzykoso/dolfin/io/HDF5File.cpp: In member function 'void dolfin::HDF5File::read(dolfin::Me\
sh&, std::string, bool) const':
2014/09/09 20:33:50 - INFO: [package:run_job] /home/johannr/.hashdist/tmp/dolfin-m2db6rzykoso/dolfin/io/HDF5File.cpp:1437:65: error: 'to_string' is not a member of 'std'
2014/09/09 20:33:50 - INFO: [package:run_job]      const std::string marker_dataset = mesh_name + "/domain_" + std::to_string(d);
2014/09/09 20:33:50 - INFO: [package:run_job]                                                                  ^
2014/09/09 20:33:52 - INFO: [package:run_job] dolfin/CMakeFiles/dolfin.dir/build.make:2219: recipe for target 'dolfin/CMakeFiles/dolfin.dir/io/HDF5File.cpp.o' failed
2014/09/09 20:33:52 - INFO: [package:run_job] CMakeFiles/Makefile2:173: recipe for target 'dolfin/CMakeFiles/dolfin.dir/all' failed
2014/09/09 20:33:52 - INFO: [package:run_job] make[2]: *** [dolfin/CMakeFiles/dolfin.dir/io/HDF5File.cpp.o] Error 1
2014/09/09 20:33:52 - INFO: [package:run_job] make[1]: *** [dolfin/CMakeFiles/dolfin.dir/all] Error 2
2014/09/09 20:33:52 - INFO: [package:run_job] Makefile:116: recipe for target 'all' failed
2014/09/09 20:33:52 - INFO: [package:run_job] make: *** [all] Error 2
2014/09/09 20:33:52 - ERROR: [package:run_job] Command '[u'/bin/bash', '_hashdist/build.sh']' returned non-zero exit status 2
2014/09/09 20:33:52 - ERROR: [package:run_job] command failed (code=2); raising

This is apparently a bug in Cygwin, however, the following simple patch fixes the problem:

diff --git a/dolfin/io/HDF5File.cpp b/dolfin/io/HDF5File.cpp
index 81d6f19..7669826 100644
--- a/dolfin/io/HDF5File.cpp
+++ b/dolfin/io/HDF5File.cpp
@@ -34,6 +34,7 @@
 #include <dolfin/common/MPI.h>
 #include <dolfin/common/NoDeleter.h>
 #include <dolfin/common/Timer.h>
+#include <dolfin/common/utils.h>
 #include <dolfin/fem/GenericDofMap.h>
 #include <dolfin/function/Function.h>
 #include <dolfin/function/FunctionSpace.h>
@@ -392,7 +393,7 @@ void HDF5File::write(const Mesh& mesh, std::size_t cell_dim,
       std::map<std::size_t, std::size_t>::const_iterator it;
       for (it = domain.begin(); it != domain.end(); ++it)
         collection.set_value(it->first, it->second);
-      const std::string marker_dataset =  name + "/domain_" + std::to_string(d);
+      const std::string marker_dataset =  name + "/domain_" + to_string(d);
       write_mesh_value_collection(collection, marker_dataset);
     }

@@ -1434,7 +1435,7 @@ void HDF5File::read(Mesh& input_mesh, const std::string mesh_name,
   // Check if we have any domains
   for (std::size_t d = 0; d <= input_mesh.topology().dim(); ++d)
   {
-    const std::string marker_dataset = mesh_name + "/domain_" + std::to_string(d);
+    const std::string marker_dataset = mesh_name + "/domain_" + to_string(d);
     if (!has_dataset(marker_dataset))
       continue;

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