diff --git a/extern/libmv/third_party/ceres/CMakeLists.txt b/extern/libmv/third_party/ceres/CMakeLists.txt
index 45e1f9b398d..5a1a2d61c48 100644
--- a/extern/libmv/third_party/ceres/CMakeLists.txt
+++ b/extern/libmv/third_party/ceres/CMakeLists.txt
@@ -312,7 +312,16 @@ endif()
 include(CheckIncludeFileCXX)
 CHECK_INCLUDE_FILE_CXX(unordered_map HAVE_STD_UNORDERED_MAP_HEADER)
 if(HAVE_STD_UNORDERED_MAP_HEADER)
-	INCLUDE (CheckCXXSourceCompiles)
+	# Even so we've found unordered_map header file it doesn't
+	# mean unordered_map and unordered_set will be declared in
+	# std namespace.
+	#
+	# Namely, MSVC 2008 have unordered_map header which declares
+	# unordered_map class in std::tr1 namespace. In order to support
+	# this, we do extra check to see which exactly namespace is
+	# to be used.
+
+	include(CheckCXXSourceCompiles)
 	CHECK_CXX_SOURCE_COMPILES("#include <unordered_map>
 	                          int main() {
 	                            std::unordered_map<int, int> map;
@@ -321,6 +330,7 @@ if(HAVE_STD_UNORDERED_MAP_HEADER)
 	                          HAVE_UNURDERED_MAP_IN_STD_NAMESPACE)
 	if(HAVE_UNURDERED_MAP_IN_STD_NAMESPACE)
 		ADD_DEFINITIONS(-DCERES_STD_UNORDERED_MAP)
+		MESSAGE("-- Found unordered_map/set in std namespace.")
 	else()
 		CHECK_CXX_SOURCE_COMPILES("#include <unordered_map>
 		                          int main() {
@@ -330,9 +340,10 @@ if(HAVE_STD_UNORDERED_MAP_HEADER)
 		                          HAVE_UNURDERED_MAP_IN_TR1_NAMESPACE)
 		if(HAVE_UNURDERED_MAP_IN_TR1_NAMESPACE)
 			ADD_DEFINITIONS(-DCERES_STD_UNORDERED_MAP_IN_TR1_NAMESPACE)
+			MESSAGE("-- Found unordered_map/set in std::tr1 namespace.")
 		else()
-			MESSAGE("-- Found <unordered_map> but can not find neither std::unordered_map "
-			        "nor std::tr1::unordered_map.")
+			MESSAGE("-- Found <unordered_map> but cannot find either std::unordered_map "
+			        "or std::tr1::unordered_map.")
 			MESSAGE("-- Replacing unordered_map/set with map/set (warning: slower!)")
 			ADD_DEFINITIONS(-DCERES_NO_UNORDERED_MAP)
 		endif()
@@ -341,6 +352,7 @@ else()
 	CHECK_INCLUDE_FILE_CXX("tr1/unordered_map" UNORDERED_MAP_IN_TR1_NAMESPACE)
 	if(UNORDERED_MAP_IN_TR1_NAMESPACE)
 		ADD_DEFINITIONS(-DCERES_TR1_UNORDERED_MAP)
+		MESSAGE("-- Found unordered_map/set in std::tr1 namespace.")
 	else()
 		MESSAGE("-- Unable to find <unordered_map> or <tr1/unordered_map>. ")
 		MESSAGE("-- Replacing unordered_map/set with map/set (warning: slower!)")
diff --git a/extern/libmv/third_party/ceres/SConscript b/extern/libmv/third_party/ceres/SConscript
index 22960e7b3bd..2573a9742ad 100644
--- a/extern/libmv/third_party/ceres/SConscript
+++ b/extern/libmv/third_party/ceres/SConscript
@@ -29,16 +29,28 @@ if env['WITH_BF_OPENMP']:
 
 conf = Configure(env)
 if conf.CheckCXXHeader("unordered_map"):
+    # Even so we've found unordered_map header file it doesn't
+    # mean unordered_map and unordered_set will be declared in
+    # std namespace.
+    #
+    # Namely, MSVC 2008 have unordered_map header which declares
+    # unordered_map class in std::tr1 namespace. In order to support
+    # this, we do extra check to see which exactly namespace is
+    # to be used.
+
     if conf.CheckType('std::unordered_map<int, int>', language = 'CXX', includes="#include <unordered_map>"):
         defs.append('CERES_STD_UNORDERED_MAP')
+        print("-- Found unordered_map/set in std namespace.")
     elif conf.CheckType('std::tr1::unordered_map<int, int>', language = 'CXX', includes="#include <unordered_map>"):
         defs.append('CERES_STD_UNORDERED_MAP_IN_TR1_NAMESPACE')
+        print("-- Found unordered_map/set in std::tr1 namespace.")
     else:
         print("-- Found <unordered_map> but can not find neither std::unordered_map nor std::tr1::unordered_map.")
         print("-- Replacing unordered_map/set with map/set (warning: slower!)")
         defs.append('CERES_NO_UNORDERED_MAP')
 elif conf.CheckCXXHeader("tr1/unordered_map"):
     defs.append('CERES_TR1_UNORDERED_MAP')
+    print("-- Found unordered_map/set in std::tr1 namespace.")
 else:
     print("-- Unable to find <unordered_map> or <tr1/unordered_map>. ")
     print("-- Replacing unordered_map/set with map/set (warning: slower!)")
diff --git a/extern/libmv/third_party/ceres/bundle.sh b/extern/libmv/third_party/ceres/bundle.sh
index 906c5d3dd48..750575862de 100755
--- a/extern/libmv/third_party/ceres/bundle.sh
+++ b/extern/libmv/third_party/ceres/bundle.sh
@@ -177,7 +177,16 @@ endif()
 include(CheckIncludeFileCXX)
 CHECK_INCLUDE_FILE_CXX(unordered_map HAVE_STD_UNORDERED_MAP_HEADER)
 if(HAVE_STD_UNORDERED_MAP_HEADER)
-	INCLUDE (CheckCXXSourceCompiles)
+	# Even so we've found unordered_map header file it doesn't
+	# mean unordered_map and unordered_set will be declared in
+	# std namespace.
+	#
+	# Namely, MSVC 2008 have unordered_map header which declares
+	# unordered_map class in std::tr1 namespace. In order to support
+	# this, we do extra check to see which exactly namespace is
+	# to be used.
+
+	include(CheckCXXSourceCompiles)
 	CHECK_CXX_SOURCE_COMPILES("#include <unordered_map>
 	                          int main() {
 	                            std::unordered_map<int, int> map;
@@ -186,6 +195,7 @@ if(HAVE_STD_UNORDERED_MAP_HEADER)
 	                          HAVE_UNURDERED_MAP_IN_STD_NAMESPACE)
 	if(HAVE_UNURDERED_MAP_IN_STD_NAMESPACE)
 		ADD_DEFINITIONS(-DCERES_STD_UNORDERED_MAP)
+		MESSAGE("-- Found unordered_map/set in std namespace.")
 	else()
 		CHECK_CXX_SOURCE_COMPILES("#include <unordered_map>
 		                          int main() {
@@ -195,9 +205,10 @@ if(HAVE_STD_UNORDERED_MAP_HEADER)
 		                          HAVE_UNURDERED_MAP_IN_TR1_NAMESPACE)
 		if(HAVE_UNURDERED_MAP_IN_TR1_NAMESPACE)
 			ADD_DEFINITIONS(-DCERES_STD_UNORDERED_MAP_IN_TR1_NAMESPACE)
+			MESSAGE("-- Found unordered_map/set in std::tr1 namespace.")
 		else()
-			MESSAGE("-- Found <unordered_map> but can not find neither std::unordered_map "
-			        "nor std::tr1::unordered_map.")
+			MESSAGE("-- Found <unordered_map> but cannot find either std::unordered_map "
+			        "or std::tr1::unordered_map.")
 			MESSAGE("-- Replacing unordered_map/set with map/set (warning: slower!)")
 			ADD_DEFINITIONS(-DCERES_NO_UNORDERED_MAP)
 		endif()
@@ -206,6 +217,7 @@ else()
 	CHECK_INCLUDE_FILE_CXX("tr1/unordered_map" UNORDERED_MAP_IN_TR1_NAMESPACE)
 	if(UNORDERED_MAP_IN_TR1_NAMESPACE)
 		ADD_DEFINITIONS(-DCERES_TR1_UNORDERED_MAP)
+		MESSAGE("-- Found unordered_map/set in std::tr1 namespace.")
 	else()
 		MESSAGE("-- Unable to find <unordered_map> or <tr1/unordered_map>. ")
 		MESSAGE("-- Replacing unordered_map/set with map/set (warning: slower!)")
@@ -248,16 +260,28 @@ if env['WITH_BF_OPENMP']:
 
 conf = Configure(env)
 if conf.CheckCXXHeader("unordered_map"):
+    # Even so we've found unordered_map header file it doesn't
+    # mean unordered_map and unordered_set will be declared in
+    # std namespace.
+    #
+    # Namely, MSVC 2008 have unordered_map header which declares
+    # unordered_map class in std::tr1 namespace. In order to support
+    # this, we do extra check to see which exactly namespace is
+    # to be used.
+
     if conf.CheckType('std::unordered_map<int, int>', language = 'CXX', includes="#include <unordered_map>"):
         defs.append('CERES_STD_UNORDERED_MAP')
+        print("-- Found unordered_map/set in std namespace.")
     elif conf.CheckType('std::tr1::unordered_map<int, int>', language = 'CXX', includes="#include <unordered_map>"):
         defs.append('CERES_STD_UNORDERED_MAP_IN_TR1_NAMESPACE')
+        print("-- Found unordered_map/set in std::tr1 namespace.")
     else:
         print("-- Found <unordered_map> but can not find neither std::unordered_map nor std::tr1::unordered_map.")
         print("-- Replacing unordered_map/set with map/set (warning: slower!)")
         defs.append('CERES_NO_UNORDERED_MAP')
 elif conf.CheckCXXHeader("tr1/unordered_map"):
     defs.append('CERES_TR1_UNORDERED_MAP')
+    print("-- Found unordered_map/set in std::tr1 namespace.")
 else:
     print("-- Unable to find <unordered_map> or <tr1/unordered_map>. ")
     print("-- Replacing unordered_map/set with map/set (warning: slower!)")