diff --git a/android/android.toolchain.cmake b/android/android.toolchain.cmake
index 494bbaebc4..f5daf307f7 100644
--- a/android/android.toolchain.cmake
+++ b/android/android.toolchain.cmake
@@ -280,6 +280,9 @@
 #   - November 2012
 #     [+] updated for NDK r8c
 #     [+] added support for clang compiler
+#   - December 2012
+#     [~] fixed ccache full path search
+#     [+] updated for NDK r8d
 # ------------------------------------------------------------------------------
 
 cmake_minimum_required( VERSION 2.6.3 )
@@ -302,7 +305,7 @@ set( CMAKE_SYSTEM_VERSION 1 )
 # rpath makes low sence for Android
 set( CMAKE_SKIP_RPATH TRUE CACHE BOOL "If set, runtime paths are not added when using shared libraries." )
 
-set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
+set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r8d -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
 if(NOT DEFINED ANDROID_NDK_SEARCH_PATHS)
  if( CMAKE_HOST_WIN32 )
   file( TO_CMAKE_PATH "$ENV{PROGRAMFILES}" ANDROID_NDK_SEARCH_PATHS )
@@ -962,7 +965,11 @@ if( BUILD_WITH_ANDROID_NDK )
   set( ANDROID_STL_INCLUDE_DIRS "${ANDROID_NDK}/sources/cxx-stl/gabi++/include" )
   set( __libstl                 "${ANDROID_NDK}/sources/cxx-stl/gabi++/libs/${ANDROID_NDK_ABI_NAME}/libgabi++_static.a" )
  elseif( ANDROID_STL MATCHES "stlport" )
-  set( ANDROID_EXCEPTIONS       OFF )
+  if( NOT ANDROID_NDK_RELEASE STRLESS "r8d" )
+   set( ANDROID_EXCEPTIONS       ON )
+  else()
+   set( ANDROID_EXCEPTIONS       OFF )
+  endif()
   if( ANDROID_NDK_RELEASE STRLESS "r7" )
    set( ANDROID_RTTI            OFF )
   else()
@@ -974,7 +981,13 @@ if( BUILD_WITH_ANDROID_NDK )
   set( ANDROID_EXCEPTIONS       ON )
   set( ANDROID_RTTI             ON )
   if( EXISTS "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
-   set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
+   if( ARMEABI_V7A AND ANDROID_COMPILER_VERSION VERSION_EQUAL "4.7" AND ANDROID_NDK_RELEASE STREQUAL "r8d" )
+    # gnustl binary for 4.7 compiler is buggy :(
+    # TODO: look for right fix
+    set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/4.6" )
+   else()
+    set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++/${ANDROID_COMPILER_VERSION}" )
+   endif()
   else()
    set( __libstl                "${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++" )
   endif()
@@ -1263,7 +1276,7 @@ endif()
 if( ANDROID_COMPILER_VERSION VERSION_EQUAL "4.6" )
  if( ANDROID_GOLD_LINKER AND (CMAKE_HOST_UNIX OR ANDROID_NDK_RELEASE STRGREATER "r8b") AND (ARMEABI OR ARMEABI_V7A OR X86) )
   set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=gold" )
- elseif( ANDROID_NDK_RELEASE STREQUAL "r8c")
+ elseif( ANDROID_NDK_RELEASE STRGREATER "r8b")
   set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=bfd" )
  elseif( ANDROID_NDK_RELEASE STREQUAL "r8b" AND ARMEABI AND NOT _CMAKE_IN_TRY_COMPILE )
   message( WARNING "The default bfd linker from arm GCC 4.6 toolchain can fail with 'unresolvable R_ARM_THM_CALL relocation' error message. See https://code.google.com/p/android/issues/detail?id=35342
@@ -1523,7 +1536,7 @@ endif()
 #   BUILD_WITH_STANDALONE_TOOLCHAIN : TRUE if standalone toolchain is used
 #   ANDROID_NDK_HOST_SYSTEM_NAME : "windows", "linux-x86" or "darwin-x86" depending on host platform
 #   ANDROID_NDK_ABI_NAME : "armeabi", "armeabi-v7a", "x86" or "mips" depending on ANDROID_ABI
-#   ANDROID_NDK_RELEASE : one of r5, r5b, r5c, r6, r6b, r7, r7b, r7c, r8, r8b, r8c; set only for NDK
+#   ANDROID_NDK_RELEASE : one of r5, r5b, r5c, r6, r6b, r7, r7b, r7c, r8, r8b, r8c, r8d; set only for NDK
 #   ANDROID_ARCH_NAME : "arm" or "x86" or "mips" depending on ANDROID_ABI
 #   ANDROID_SYSROOT : path to the compiler sysroot
 #   TOOL_OS_SUFFIX : "" or ".exe" depending on host platform
diff --git a/cmake/OpenCVPCHSupport.cmake b/cmake/OpenCVPCHSupport.cmake
index fac6bd409b..cfc4bfa724 100644
--- a/cmake/OpenCVPCHSupport.cmake
+++ b/cmake/OpenCVPCHSupport.cmake
@@ -19,7 +19,7 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
         ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
         OUTPUT_VARIABLE gcc_compiler_version)
     #MESSAGE("GCC Version: ${gcc_compiler_version}")
-    IF(gcc_compiler_version MATCHES "4\\.[0,2-9]\\.[0-9x]")
+    IF(gcc_compiler_version VERSION_GREATER "4.2.-1")
         SET(PCHSupport_FOUND TRUE)
     ENDIF()
 
diff --git a/modules/ts/include/opencv2/ts/ts_gtest.h b/modules/ts/include/opencv2/ts/ts_gtest.h
index 3d61a0eac9..585650ff03 100644
--- a/modules/ts/include/opencv2/ts/ts_gtest.h
+++ b/modules/ts/include/opencv2/ts/ts_gtest.h
@@ -433,8 +433,8 @@
 // Defines this to true iff Google Test can use POSIX regular expressions.
 #ifndef GTEST_HAS_POSIX_RE
 # if GTEST_OS_LINUX_ANDROID
-// On Android, <regex.h> is only available starting with Gingerbread.
-#  define GTEST_HAS_POSIX_RE (__ANDROID_API__ >= 9)
+// On Android, <regex.h> is only available starting with Froyo.
+#  define GTEST_HAS_POSIX_RE (__ANDROID_API__ >= 8)
 # else
 # define GTEST_HAS_POSIX_RE (!GTEST_OS_WINDOWS)
 #endif
diff --git a/modules/ts/src/ts_gtest.cpp b/modules/ts/src/ts_gtest.cpp
index 2e58194708..a718fc036b 100644
--- a/modules/ts/src/ts_gtest.cpp
+++ b/modules/ts/src/ts_gtest.cpp
@@ -1340,6 +1340,7 @@ GTEST_API_ bool IsAsciiWhiteSpace(char ch);
 GTEST_API_ bool IsAsciiWordChar(char ch);
 GTEST_API_ bool IsValidEscape(char ch);
 GTEST_API_ bool AtomMatchesChar(bool escaped, char pattern, char ch);
+GTEST_API_ std::string FormatRegexSyntaxError(const char* regex, int index);
 GTEST_API_ bool ValidateRegex(const char* regex);
 GTEST_API_ bool MatchRegexAtHead(const char* regex, const char* str);
 GTEST_API_ bool MatchRepetitionAndRegexAtHead(