diff --git a/Build.PL b/Build.PL
index ef17ec046..1c3b0e3a7 100644
--- a/Build.PL
+++ b/Build.PL
@@ -16,6 +16,8 @@ my %prereqs = qw(
     ExtUtils::MakeMaker             6.80
     ExtUtils::ParseXS               3.22
     ExtUtils::XSpp                  0
+    ExtUtils::XSpp::Cmd             0
+    ExtUtils::CppGuess              0
     ExtUtils::Typemaps              0
     ExtUtils::Typemaps::Basic       0
     File::Basename                  0
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 719bdd04e..de435813d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -241,7 +241,9 @@ if(NOT WIN32)
 endif()
 find_package(Boost ${MINIMUM_BOOST_VERSION} REQUIRED COMPONENTS system filesystem thread log locale regex)
 if(Boost_FOUND)
-#    include_directories(SYSTEM ${Boost_INCLUDE_DIRS})
+#    message("Boost include dir: ${Boost_INCLUDE_DIRS}")
+#    message("Boost library dirs: ${Boost_LIBRARY_DIRS}")
+#    message("Boost libraries: ${Boost_LIBRARIES}")
     if (APPLE)
         # BOOST_ASIO_DISABLE_KQUEUE : prevents a Boost ASIO bug on OS X: https://svn.boost.org/trac/boost/ticket/5339
         add_definitions(-DBOOST_ASIO_DISABLE_KQUEUE)
diff --git a/deps/deps-windows.cmake b/deps/deps-windows.cmake
index b3b31e5f3..f20ffcc77 100644
--- a/deps/deps-windows.cmake
+++ b/deps/deps-windows.cmake
@@ -1,21 +1,34 @@
-
+# https://cmake.org/cmake/help/latest/variable/MSVC_VERSION.html
 if (MSVC_VERSION EQUAL 1800)
+# 1800      = VS 12.0 (v120 toolset)
     set(DEP_VS_VER "12")
     set(DEP_BOOST_TOOLSET "msvc-12.0")
 elseif (MSVC_VERSION EQUAL 1900)
+# 1900      = VS 14.0 (v140 toolset)    
     set(DEP_VS_VER "14")
     set(DEP_BOOST_TOOLSET "msvc-14.0")
-elseif (MSVC_VERSION GREATER 1900)
+elseif (MSVC_VERSION LESS 1920)
+# 1910-1919 = VS 15.0 (v141 toolset)
     set(DEP_VS_VER "15")
     set(DEP_BOOST_TOOLSET "msvc-14.1")
+elseif (MSVC_VERSION LESS 1930)
+# 1920-1929 = VS 16.0 (v142 toolset)
+    set(DEP_VS_VER "16")
+    set(DEP_BOOST_TOOLSET "msvc-14.2")
 else ()
     message(FATAL_ERROR "Unsupported MSVC version")
 endif ()
 
 if (${DEPS_BITS} EQUAL 32)
     set(DEP_MSVC_GEN "Visual Studio ${DEP_VS_VER}")
+    set(DEP_PLATFORM "Win32")
 else ()
-    set(DEP_MSVC_GEN "Visual Studio ${DEP_VS_VER} Win64")
+    if (DEP_VS_VER LESS 16)
+        set(DEP_MSVC_GEN "Visual Studio ${DEP_VS_VER} Win64")
+    else ()
+        set(DEP_MSVC_GEN "Visual Studio ${DEP_VS_VER}")
+    endif ()
+    set(DEP_PLATFORM "x64")
 endif ()
 
 
@@ -28,8 +41,8 @@ endif ()
 
 ExternalProject_Add(dep_boost
     EXCLUDE_FROM_ALL 1
-    URL "https://dl.bintray.com/boostorg/release/1.66.0/source/boost_1_66_0.tar.gz"
-    URL_HASH SHA256=bd0df411efd9a585e5a2212275f8762079fed8842264954675a4fddc46cfcf60
+    URL "https://dl.bintray.com/boostorg/release/1.70.0/source/boost_1_70_0.tar.gz"
+    URL_HASH SHA256=882b48708d211a5f48e60b0124cf5863c1534cd544ecd0664bb534a4b5d506e9
     BUILD_IN_SOURCE 1
     CONFIGURE_COMMAND bootstrap.bat
     BUILD_COMMAND b2.exe
@@ -57,6 +70,7 @@ ExternalProject_Add(dep_tbb
     URL "https://github.com/wjakob/tbb/archive/a0dc9bf76d0120f917b641ed095360448cabc85b.tar.gz"
     URL_HASH SHA256=0545cb6033bd1873fcae3ea304def720a380a88292726943ae3b9b207f322efe
     CMAKE_GENERATOR "${DEP_MSVC_GEN}"
+    CMAKE_GENERATOR_PLATFORM "${DEP_PLATFORM}"
     CMAKE_ARGS
         -DCMAKE_DEBUG_POSTFIX=_debug
         -DTBB_BUILD_SHARED=OFF
@@ -81,6 +95,7 @@ ExternalProject_Add(dep_gtest
     URL "https://github.com/google/googletest/archive/release-1.8.1.tar.gz"
     URL_HASH SHA256=9bf1fe5182a604b4135edc1a425ae356c9ad15e9b23f9f12a02e80184c3a249c
     CMAKE_GENERATOR "${DEP_MSVC_GEN}"
+    CMAKE_GENERATOR_PLATFORM "${DEP_PLATFORM}"
     CMAKE_ARGS
         -DBUILD_GMOCK=OFF
         -Dgtest_force_shared_crt=ON
@@ -105,6 +120,7 @@ ExternalProject_Add(dep_nlopt
     URL "https://github.com/stevengj/nlopt/archive/v2.5.0.tar.gz"
     URL_HASH SHA256=c6dd7a5701fff8ad5ebb45a3dc8e757e61d52658de3918e38bab233e7fd3b4ae
     CMAKE_GENERATOR "${DEP_MSVC_GEN}"
+    CMAKE_GENERATOR_PLATFORM "${DEP_PLATFORM}"
     CMAKE_ARGS
         -DBUILD_SHARED_LIBS=OFF
         -DNLOPT_PYTHON=OFF
@@ -133,6 +149,7 @@ ExternalProject_Add(dep_zlib
     URL "https://zlib.net/zlib-1.2.11.tar.xz"
     URL_HASH SHA256=4ff941449631ace0d4d203e3483be9dbc9da454084111f97ea0a2114e19bf066
     CMAKE_GENERATOR "${DEP_MSVC_GEN}"
+    CMAKE_GENERATOR_PLATFORM "${DEP_PLATFORM}"
     CMAKE_ARGS
         -DSKIP_INSTALL_FILES=ON                                    # Prevent installation of man pages et al.
         "-DINSTALL_BIN_DIR=${CMAKE_CURRENT_BINARY_DIR}\\fallout"   # I found no better way of preventing zlib from creating & installing DLLs :-/
diff --git a/xs/src/xsinit.h b/xs/src/xsinit.h
index 506ef0a0b..f14e1262d 100644
--- a/xs/src/xsinit.h
+++ b/xs/src/xsinit.h
@@ -69,7 +69,10 @@ extern "C" {
     #undef fwrite
     #undef fclose
     #undef sleep
+    #undef snprintf
+    #undef strerror
     #undef test
+    #undef times
     #undef accept
     #undef wait