diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index a68764ff46..8dbaed09d6 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -44,10 +44,12 @@ OPTION(BUILD_CONVERT "Build IfcConvert executable." ON)
 OPTION(USE_VLD "Use Visual Leak Detector for debugging memory leaks, MSVC-only." OFF)
 OPTION(USE_MMAP "Adds a command line options to parse IFC files from memory mapped files using Boost.Iostreams" OFF)
 OPTION(USE_VOXELS "Use voxelized geometries as a fallback mechanism to calculate quantities in IfcGeomServer" OFF)
+OPTION(USE_CGAL "Use CGAL as an alternative geometry kernel implementation" OFF)
 if (${HAS_MAX})
 OPTION(BUILD_IFCMAX "Build IfcMax, a 3ds Max plug-in, Windows-only." ON)
 endif()
 OPTION(BUILD_SHARED_LIBS "Build IfcParse and IfcGeom as shared libs (SO/DLL)." OFF)
+OPTION(USE_STATIC_MSVC_RUNTIME "Link to the static runtime on MSVC." ON)
 
 # TODO QtViewer is deprecated ATM as it uses the 0.4 API
 # OPTION(BUILD_QTVIEWER "Build IfcOpenShell Qt GUI Viewer (requires Qt 4 framework)." OFF)
@@ -147,8 +149,10 @@ ENDMACRO()
 # runtime, when doing running conda-build we pick what conda prepared for us.
 IF(WIN32 AND ("$ENV{CONDA_BUILD}" STREQUAL ""))
 	SET(Boost_USE_STATIC_LIBS ON)
-	SET(Boost_USE_STATIC_RUNTIME ON)
 	SET(Boost_USE_MULTITHREADED ON)
+    if (USE_STATIC_MSVC_RUNTIME)
+        SET(Boost_USE_STATIC_RUNTIME ON)
+    endif()
 ELSE()
     # Disable Boost's autolinking as the libraries to be linked to are supplied
     # already by CMake, and it's going to conflict if there are multiple, as is
@@ -268,6 +272,11 @@ foreach(lib ${OPENCASCADE_LIBRARY_NAMES})
 	list(APPEND OPENCASCADE_LIBRARIES "${lib_path}")
 endforeach()
 
+list(APPEND GEOMETRY_KERNELS opencascade)
+
+if (USE_CGAL)
+add_definitions(-DIFOPSH_USE_CGAL)
+list(APPEND GEOMETRY_KERNELS cgal)
 SET(CGAL_LIBRARY_NAMES libCGAL_Core libCGAL_ImageIO libCGAL)
 # Find CGAL
 IF("${CGAL_INCLUDE_DIR}" STREQUAL "")
@@ -316,6 +325,7 @@ IF(NOT libMPFR)
 ENDIF()
 list(APPEND CGAL_LIBRARIES "${libMPFR}")
 list(APPEND CGAL_LIBRARIES "${libGMP}")
+endif()
 
 if(MSVC)
     add_definitions(-DHAVE_NO_DLL)
@@ -473,20 +483,22 @@ IF(MSVC)
 		# @todo currently fails
         # add_definitions(-permissive-)
     endif()
-	# Link against the static VC runtime
-    # TODO Make this configurable
-	IF("$ENV{CONDA_BUILD}" STREQUAL "")
-	FOREACH(flag CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL
-			CMAKE_CXX_FLAGS_RELWITHDEBINFO CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
-			CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
-		IF(${flag} MATCHES "/MD")
-			STRING(REGEX REPLACE "/MD" "/MT" ${flag} "${${flag}}")
-		ENDIF()
-		IF(${flag} MATCHES "/MDd")
-			STRING(REGEX REPLACE "/MDd" "/MTd" ${flag} "${${flag}}")
-		ENDIF()
-	ENDFOREACH()
-	ENDIF()
+    
+    if(USE_STATIC_MSVC_RUNTIME)
+        # Link against the static VC runtime
+        IF("$ENV{CONDA_BUILD}" STREQUAL "")
+        FOREACH(flag CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL
+                CMAKE_CXX_FLAGS_RELWITHDEBINFO CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
+                CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
+            IF(${flag} MATCHES "/MD")
+                STRING(REGEX REPLACE "/MD" "/MT" ${flag} "${${flag}}")
+            ENDIF()
+            IF(${flag} MATCHES "/MDd")
+                STRING(REGEX REPLACE "/MDd" "/MTd" ${flag} "${${flag}}")
+            ENDIF()
+        ENDFOREACH()
+        ENDIF()
+    endif()
 ElSE()
     add_definitions(-Wall -Wextra)
     if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
@@ -595,7 +607,7 @@ TARGET_LINK_LIBRARIES(IfcParse ${Boost_LIBRARIES} ${BCRYPT_LIBRARIES} ${LIBXML2_
 
 if (BUILD_IFCGEOM)
 
-foreach(kernel opencascade cgal)
+foreach(kernel ${GEOMETRY_KERNELS})
 string(TOUPPER ${kernel} KERNEL_UPPER)
 file(GLOB IFCGEOM_H_FILES ../src/ifcgeom/schema_agnostic/${kernel}/*.h)
 file(GLOB IFCGEOM_CPP_FILES ../src/ifcgeom/schema_agnostic/${kernel}/*.cpp)
@@ -618,7 +630,7 @@ set_target_properties(IfcGeom_ifc${schema} PROPERTIES COMPILE_FLAGS "-DIFC_GEOM_
 target_link_libraries(IfcGeom_ifc${schema} IfcParse)
 list(APPEND IfcGeom_libraries IfcGeom_ifc${schema})
 
-foreach(kernel opencascade cgal)
+foreach(kernel ${GEOMETRY_KERNELS})
 file(GLOB IFCGEOM_H_FILES ../src/ifcgeom/kernels/${kernel}/*.h)
 file(GLOB IFCGEOM_CPP_FILES ../src/ifcgeom/kernels/${kernel}/*.cpp)
 set(IFCGEOM_FILES ${IFCGEOM_CPP_FILES} ${IFCGEOM_H_FILES})
diff --git a/src/ifcgeom/schema_agnostic/Kernel.cpp b/src/ifcgeom/schema_agnostic/Kernel.cpp
index 2ae967b35b..b006963b58 100644
--- a/src/ifcgeom/schema_agnostic/Kernel.cpp
+++ b/src/ifcgeom/schema_agnostic/Kernel.cpp
@@ -64,14 +64,18 @@ IfcGeom::impl::KernelFactoryImplementation& IfcGeom::impl::kernel_implementation
 
 extern void init_KernelImplementation_opencascade_Ifc2x3(IfcGeom::impl::KernelFactoryImplementation*);
 extern void init_KernelImplementation_opencascade_Ifc4(IfcGeom::impl::KernelFactoryImplementation*);
+#ifdef IFOPSH_USE_CGAL
 extern void init_KernelImplementation_cgal_Ifc2x3(IfcGeom::impl::KernelFactoryImplementation*);
 extern void init_KernelImplementation_cgal_Ifc4(IfcGeom::impl::KernelFactoryImplementation*);
+#endif
 
 IfcGeom::impl::KernelFactoryImplementation::KernelFactoryImplementation() {
 	init_KernelImplementation_opencascade_Ifc2x3(this);
 	init_KernelImplementation_opencascade_Ifc4(this);
+#ifdef IFOPSH_USE_CGAL
 	init_KernelImplementation_cgal_Ifc2x3(this);
 	init_KernelImplementation_cgal_Ifc4(this);
+#endif
 }
 
 void IfcGeom::impl::KernelFactoryImplementation::bind(const std::string& schema_name, const std::string& geometry_library, IfcGeom::impl::kernel_fn fn) {
diff --git a/win/build-deps.cmd b/win/build-deps.cmd
index 56ea0b66fd..045bec841f 100644
--- a/win/build-deps.cmd
+++ b/win/build-deps.cmd
@@ -149,11 +149,18 @@ echo.
 
 cd "%DEPS_DIR%"
 
+:: Define the version strings at the top in case individual dependencies are skipped
+set BOOST_VERSION=1.67.0
+set BOOST_VER=%BOOST_VERSION:.=_%
+set OCCT_VERSION=7.3.0
+set OCE_VERSION=OCE-0.18
+set PYTHON_VERSION=3.4.3
+set SWIG_VERSION=3.0.12
+
 :: Note all of the dependencies have appropriate label so that user can easily skip something if wanted
 :: by modifying this file and using goto.
 :Boost
 :: NOTE Boost < 1.64 doesn't work without tricks if the user has only VS 2017 installed and no earlier versions.
-set BOOST_VERSION=1.67.0
 :: Version string with underscores instead of dots.
 set BOOST_VER=%BOOST_VERSION:.=_%
 :: DEPENDENCY_NAME is used for logging and DEPENDENCY_DIR for saving from some redundant typing
@@ -191,7 +198,8 @@ if %VS_VER% LSS 2017 (
     set BOOST_VC_VER=-%VC_VER%.0
 )
 
-call .\b2 toolset=msvc%BOOST_VC_VER% runtime-link=static address-model=%ARCH_BITS% -j%IFCOS_NUM_BUILD_PROCS% ^
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" set RUNTIME_LINK_STATIC=runtime-link=static
+call .\b2 toolset=msvc%BOOST_VC_VER% %RUNTIME_LINK_STATIC% address-model=%ARCH_BITS% -j%IFCOS_NUM_BUILD_PROCS% ^
     variant=%DEBUG_OR_RELEASE_LOWERCASE% %BOOST_LIBS% stage --stagedir=stage/vs%VS_VER%-%VS_PLATFORM% 
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 
@@ -216,7 +224,8 @@ IF NOT %ERRORLEVEL%==0 git apply --reject --whitespace=fix "%~dp0patches\OpenCOL
 :: uncomment to following line in order to delete the CMakeCache.txt always if experiencing problems.
 REM IF EXIST "%DEPENDENCY_DIR%\%BUILD_DIR%\CMakeCache.txt". del "%DEPENDENCY_DIR%\%BUILD_DIR%\CMakeCache.txt"
 :: NOTE Enforce that the embedded LibXml2 and PCRE are used as there might be problems with arbitrary versions of the libraries.
-call :RunCMake -DCMAKE_INSTALL_PREFIX="%INSTALL_DIR%\OpenCOLLADA" -DUSE_STATIC_MSVC_RUNTIME=1 -DCMAKE_DEBUG_POSTFIX=d ^
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" set STATIC_RUNTIME_1=-DUSE_STATIC_MSVC_RUNTIME=1
+call :RunCMake -DCMAKE_INSTALL_PREFIX="%INSTALL_DIR%\OpenCOLLADA" %STATIC_RUNTIME_1% -DCMAKE_DEBUG_POSTFIX=d ^
                -DLIBXML2_LIBRARIES="" -DLIBXML2_INCLUDE_DIR="" -DPCRE_INCLUDE_DIR="" -DPCRE_LIBRARIES=""
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 REM IF NOT EXIST "%DEPS_DIR%\OpenCOLLADA\%BUILD_DIR%\lib\%DEBUG_OR_RELEASE%\OpenCOLLADASaxFrameworkLoader.lib".
@@ -227,7 +236,6 @@ IF NOT %ERRORLEVEL%==0 GOTO :Error
 
 if %IFCOS_USE_OCCT%==FALSE goto :OCE
 :OCCT
-set OCCT_VERSION=7.3.0
 SET OCCT_VER=V%OCCT_VERSION:.=_%
 
 set OCC_INCLUDE_DIR=%INSTALL_DIR%\opencascade-%OCCT_VERSION%\inc>>"%~dp0\BuildDepsCache-%TARGET_ARCH%.txt"
@@ -268,10 +276,11 @@ if not %ERRORLEVEL%==0 (
 )
 findstr IfcOpenShell "%DEPENDENCY_DIR%\CMakeLists.txt">NUL
 if not %ERRORLEVEL%==0 goto :Error
-
+OCCT_USE_STATIC_RUNTIME
 cd "%DEPENDENCY_DIR%"
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" set STATIC_RUNTIME_1=-DOCCT_USE_STATIC_RUNTIME=1
 call :RunCMake -DINSTALL_DIR="%INSTALL_DIR%\opencascade-%OCCT_VERSION%" -DBUILD_LIBRARY_TYPE="Static" -DCMAKE_DEBUG_POSTFIX=d ^
-    -DBUILD_MODULE_Draw=0 -D3RDPARTY_FREETYPE_DIR="%INSTALL_DIR%\freetype"
+    -DBUILD_MODULE_Draw=0 -D3RDPARTY_FREETYPE_DIR="%INSTALL_DIR%\freetype" %STATIC_RUNTIME_1%
 if not %ERRORLEVEL%==0 goto :Error
 call :BuildSolution "%DEPENDENCY_DIR%\%BUILD_DIR%\OCCT.sln" %BUILD_CFG%
 if not %ERRORLEVEL%==0 goto :Error
@@ -303,7 +312,6 @@ echo OCC_LIBRARY_DIR=%OCC_LIBRARY_DIR%>>"%~dp0\BuildDepsCache-%TARGET_ARCH%.txt"
 
 set DEPENDENCY_NAME=Open CASCADE Community Edition
 set DEPENDENCY_DIR=%DEPS_DIR%\oce
-set OCE_VERSION=OCE-0.18
 call :GitCloneAndCheckoutRevision https://github.com/tpaviot/oce.git "%DEPENDENCY_DIR%" %OCE_VERSION%
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 :: Use the oce-win-bundle for OCE's dependencies
@@ -313,8 +321,9 @@ IF NOT %ERRORLEVEL%==0 GOTO :Error
 cd "%DEPENDENCY_DIR%"
 :: NOTE Specify OCE_NO_LIBRARY_VERSION as rc.exe can fail due to long filenames and huge command-line parameter
 :: input (more than 32,000 characters). Could maybe try using subst for the build dir to overcome this.
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" set STATIC_RUNTIME_1=-DOCE_USE_STATIC_MSVC_RUNTIME=1
 call :RunCMake  -DOCE_BUILD_SHARED_LIB=0 -DOCE_INSTALL_PREFIX="%INSTALL_DIR%\oce" -DOCE_TESTING=0 ^
-                -DOCE_NO_LIBRARY_VERSION=1 -DOCE_USE_STATIC_MSVC_RUNTIME=1
+                -DOCE_NO_LIBRARY_VERSION=1 %STATIC_RUNTIME_1%
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 call :BuildSolution "%DEPENDENCY_DIR%\%BUILD_DIR%\OCE.sln" %BUILD_CFG%
 IF NOT %ERRORLEVEL%==0 GOTO :Error
@@ -324,7 +333,6 @@ IF NOT %ERRORLEVEL%==0 GOTO :Error
 :Python
 :: TODO Update to 3.5 when it's released as it will have an option to install debug libraries.
 :: NOTE If updating the default Python version, change PY_VER_MAJOR_MINOR accordingly in run-cmake.bat
-set PYTHON_VERSION=3.4.3
 IF "%IFCOS_USE_PYTHON2%"=="TRUE" set PYTHON_VERSION=2.7.10
 set PY_VER_MAJOR_MINOR=%PYTHON_VERSION:~0,3%
 set PY_VER_MAJOR_MINOR=%PY_VER_MAJOR_MINOR:.=%
@@ -362,7 +370,6 @@ IF "%IFCOS_INSTALL_PYTHON%"=="TRUE" (
 )
 
 :SWIG
-set SWIG_VERSION=3.0.12
 set DEPENDENCY_NAME=SWIG %SWIG_VERSION%
 set DEPENDENCY_DIR=N/A
 set SWIG_ZIP=swigwin-%SWIG_VERSION%.zip
@@ -406,6 +413,7 @@ git reset --hard
 REM There probably need to be quotes here around the filename
 powershell -c "get-content %~dp0patches\mpir.patch | %%{$_ -replace \"sdk\",\"%UCRTVersion%\"} | %%{$_ -replace \"fn\",\"lib_mpir_cxx\"}" | git apply --unidiff-zero
 powershell -c "get-content %~dp0patches\mpir.patch | %%{$_ -replace \"sdk\",\"%UCRTVersion%\"} | %%{$_ -replace \"fn\",\"lib_mpir_gc\"}" | git apply --unidiff-zero
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" git apply "%~dp0patches\mpir_runtime.patch"
 cd msvc
 cd vs%VS_VER:~2,2%
 call .\msbuild.bat gc LIB %VS_PLATFORM% Release
@@ -421,16 +429,8 @@ call :GitCloneAndCheckoutRevision https://github.com/BrianGladman/mpfr.git "%DEP
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 cd "%DEPENDENCY_DIR%"
 git reset --hard
-for /f "delims=|" %%f in ('dir /s/b build.vc15\*.vcxproj') do (
-    set "full=%%f"
-    set rel=!full:*%DEPENDENCY_DIR%=!
-    set relnix=!rel:\=/!
-    powershell -c "get-content %~dp0patches\mpfr.patch | %%{$_ -replace \"sdk\",\"%UCRTVersion%\"} | %%{$_ -replace \"fn\",\"!relnix!\"}" | git apply --unidiff-zero
-    git diff --exit-code -- %%f
-    IF !ERRORLEVEL!==0 (
-        powershell -c "get-content %~dp0patches\mpfr2.patch | %%{$_ -replace \"sdk\",\"%UCRTVersion%\"} | %%{$_ -replace \"fn\",\"!relnix!\"}" | git apply --unidiff-zero
-    )
-)
+powershell -c "get-content %~dp0patches\mpfr.patch | %%{$_ -replace \"sdk\",\"%UCRTVersion%\"}" | git apply --unidiff-zero
+if NOT "%USE_STATIC_RUNTIME%"=="FALSE" git apply "%~dp0patches\mpfr_runtime.patch"
 call :BuildSolution "%DEPENDENCY_DIR%\build.vc15\lib_mpfr.sln" %DEBUG_OR_RELEASE% lib_mpfr
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 IF NOT EXIST "%INSTALL_DIR%\mpfr". mkdir "%INSTALL_DIR%\mpfr"
@@ -438,19 +438,20 @@ copy lib\%VS_PLATFORM%\Release\* "%INSTALL_DIR%\mpfr"
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 
 :cgal
-set DEPENDENCY_NAME=mpfr
+set DEPENDENCY_NAME=cgal
 set DEPENDENCY_DIR=%DEPS_DIR%\cgal
 call :GitCloneAndCheckoutRevision https://github.com/CGAL/cgal.git "%DEPENDENCY_DIR%" releases/CGAL-4.13.1
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 cd "%DEPENDENCY_DIR%"
+git reset --hard
+git apply "%~dp0patches\cgal_no_zlib.patch"
 call :RunCMake -DCMAKE_INSTALL_PREFIX="%INSTALL_DIR%\cgal"    ^
                -DBOOST_ROOT="%DEPS_DIR%\boost_%BOOST_VER%"    ^
                -DGMP_INCLUDE_DIR="%INSTALL_DIR%\mpir"         ^
                -DGMP_LIBRARIES="%INSTALL_DIR%\mpir\mpir.lib"  ^
                -DMPFR_INCLUDE_DIR="%INSTALL_DIR%\mpfr"        ^
                -DMPFR_LIBRARIES="%INSTALL_DIR%\mpfr\mpfr.lib" ^
-               -DCGAL_BUILD_SHARED_LIBS=Off                   ^
-               -DBUILD_SHARED_LIBS=Off                        ^
+               -DBUILD_SHARED_LIBS=On                         ^
                -DBOOST_LIBRARYDIR="%DEPS_DIR%\boost_%BOOST_VER%\stage\vs%VS_VER%-%VS_PLATFORM%\lib"
 IF NOT %ERRORLEVEL%==0 GOTO :Error
 call :BuildSolution "%DEPENDENCY_DIR%\%BUILD_DIR%\CGAL.sln" %BUILD_CFG%
diff --git a/win/patches/V7_3_0.patch b/win/patches/V7_3_0.patch
index efc9154b75..637c8c5de7 100644
--- a/win/patches/V7_3_0.patch
+++ b/win/patches/V7_3_0.patch
@@ -27,7 +27,7 @@ index 09da18d38..a07b9cf74 100644
 +# set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DNo_Exception")
 +# set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -DNo_Exception")
 +
-+if (MSVC)
++if (OCCT_USE_STATIC_RUNTIME AND MSVC)
 +    foreach(flag CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL
 +            CMAKE_CXX_FLAGS_RELWITHDEBINFO CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
 +            CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
diff --git a/win/patches/cgal_no_zlib.patch b/win/patches/cgal_no_zlib.patch
new file mode 100644
index 0000000000..1b24a17e19
--- /dev/null
+++ b/win/patches/cgal_no_zlib.patch
@@ -0,0 +1,13 @@
+diff --git a/Installation/cmake/modules/CGAL_SetupCGAL_ImageIODependencies.cmake b/Installation/cmake/modules/CGAL_SetupCGAL_ImageIODependencies.cmake
+index 8ac856d037..742fa8df69 100644
+--- a/Installation/cmake/modules/CGAL_SetupCGAL_ImageIODependencies.cmake
++++ b/Installation/cmake/modules/CGAL_SetupCGAL_ImageIODependencies.cmake
+@@ -23,7 +23,7 @@ set(CGAL_SetupCGAL_ImageIODependencies_included TRUE)
+ # Used Modules
+ # ^^^^^^^^^^^^
+ #   - :module:`FindZLIB`
+-find_package( ZLIB )
++# find_package( ZLIB )
+ 
+ define_property(TARGET PROPERTY CGAL_TARGET_USES_ZLIB
+   BRIEF_DOCS "Tells if the target uses ZLIB as a dependency"
diff --git a/win/patches/mpfr.patch b/win/patches/mpfr.patch
index 0ca9f4f15b..32a5520021 100644
--- a/win/patches/mpfr.patch
+++ b/win/patches/mpfr.patch
@@ -1,5 +1,5 @@
---- afn
-+++ bfn
-@@ -26 +26 @@
+--- a/build.vc15/lib_mpfr/lib_mpfr.vcxproj
++++ a/build.vc15/lib_mpfr/lib_mpfr.vcxproj
+@@ -25 +25 @@
 -    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
 +    <WindowsTargetPlatformVersion>sdk</WindowsTargetPlatformVersion>
diff --git a/win/patches/mpfr_runtime.patch b/win/patches/mpfr_runtime.patch
new file mode 100644
index 0000000000..1f3df90d82
--- /dev/null
+++ b/win/patches/mpfr_runtime.patch
@@ -0,0 +1,8 @@
+--- a/build.vc15/lib_mpfr/lib_mpfr.vcxproj
++++ a/build.vc15/lib_mpfr/lib_mpfr.vcxproj
+@@ -148 +148 @@
+-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
++      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+@@ -179 +179 @@
+-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
++      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
diff --git a/win/patches/mpir.patch b/win/patches/mpir.patch
new file mode 100644
index 0000000000..0bbb105617
--- /dev/null
+++ b/win/patches/mpir.patch
@@ -0,0 +1,7 @@
+diff --git a/msvc/vs17/fn/fn.vcxproj b/msvc/vs17/fn/fn.vcxproj
+index d8d87f8f..e543adc8 100644
+--- a/msvc/vs17/fn/fn.vcxproj
++++ b/msvc/vs17/fn/fn.vcxproj
+@@ -25 +25 @@
+-    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
++    <WindowsTargetPlatformVersion>sdk</WindowsTargetPlatformVersion>
diff --git a/win/patches/mpir_runtime.patch b/win/patches/mpir_runtime.patch
new file mode 100644
index 0000000000..abb5f0bc86
--- /dev/null
+++ b/win/patches/mpir_runtime.patch
@@ -0,0 +1,13 @@
+diff --git a/msvc/mpir_release_lib.props b/msvc/mpir_release_lib.props
+index d46f9649..832c6937 100644
+--- a/msvc/mpir_release_lib.props
++++ b/msvc/mpir_release_lib.props
+@@ -9,7 +9,7 @@
+   <ItemDefinitionGroup>
+     <ClCompile>
+       <ObjectFileName>$(IntDir)du\m\my\%(RelativeDir)</ObjectFileName>
+-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
++      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+       <ProgramDataBaseFileName>$(TargetDir)$(TargetName).pdb</ProgramDataBaseFileName>
+     </ClCompile>
+     <Link>