diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 00000000..e4ccf834
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,216 @@
+cmake_minimum_required(VERSION 3.15)
+
+project(opennurbs CXX C)
+
+if(NOT "${CMAKE_CXX_STANDARD}")
+  # setting the C++ standard if not specified
+  if(DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION
+     OR DEFINED CMAKE_CXX20_EXTENSION_COMPILE_OPTION)
+    set(CXX_LATEST_STANDARD 20)
+  elseif(DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION
+         OR DEFINED CMAKE_CXX17_EXTENSION_COMPILE_OPTION)
+    set(CXX_LATEST_STANDARD 17)
+  elseif(DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION
+         OR DEFINED CMAKE_CXX14_EXTENSION_COMPILE_OPTION)
+    set(CXX_LATEST_STANDARD 14)
+  else()
+    set(CXX_LATEST_STANDARD 11)
+  endif()
+  set(CMAKE_CXX_STANDARD ${CXX_LATEST_STANDARD})
+endif()
+message(STATUS "CMAKE_CXX_STANDARD: ${CXX_LATEST_STANDARD}")
+
+# opennurbs source
+file(GLOB opennurbs_SOURCE "${CMAKE_SOURCE_DIR}/*.h"
+     "${CMAKE_SOURCE_DIR}/*.cpp")
+# exclude the examples
+list(FILTER opennurbs_SOURCE EXCLUDE REGEX "${CMAKE_SOURCE_DIR}/example*")
+
+if(NOT CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  list(REMOVE_ITEM opennurbs_SOURCE
+       "${CMAKE_SOURCE_DIR}/opennurbs_unicode_cp932.cpp")
+  list(REMOVE_ITEM opennurbs_SOURCE
+       "${CMAKE_SOURCE_DIR}/opennurbs_unicode_cp949.cpp")
+endif()
+
+# remove opennurbs_gl if no opengl
+find_package(OpenGL)
+if(NOT ${OPENGL_FOUND})
+  message(WARNING "OpenGL not found. Excluding opennurbs_gl")
+  list(REMOVE_ITEM opennurbs_SOURCE "${CMAKE_SOURCE_DIR}/opennurbs_gl.cpp")
+endif()
+
+# Build the opennurbs library
+option(OPENNURBS_SHARED "Build shared libraries" OFF)
+if(${OPENNURBS_SHARED})
+  # if dynamic
+
+  # opennurbs shared library
+  add_library(opennurbs SHARED ${opennurbs_SOURCE})
+
+  # define opennurbs_EXPORTS to compile as a shared library
+  target_compile_definitions(opennurbs PRIVATE OPENNURBS_EXPORTS
+                                               ON_COMPILING_OPENNURBS)
+
+  # define OPENNURBS_IMORTS for the usage of the library
+  message(
+    WARNING
+      "Define `OPENNURBS_IMORTS` when using the opennurbs.dll before including opennurbs_public.h\n  target_compile_definitions(main PUBLIC OPENNURBS_IMPORTS)"
+  )
+else()
+  # if static
+
+  if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    add_library(opennurbs STATIC ${opennurbs_SOURCE})
+  else()
+    if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL
+                                             "Android")
+      # Include UUID source (bundled with opennurbs)
+      file(GLOB UUID_SRC "${CMAKE_SOURCE_DIR}/android_uuid/*.h"
+           "${CMAKE_SOURCE_DIR}/android_uuid/*.c")
+      list(REMOVE_ITEM UUID_SRC
+           "${CMAKE_SOURCE_DIR}/android_uuid/gen_uuid_nt.c")
+    endif()
+
+    # Need to combine all source files for static linking on non-windows
+    add_library(opennurbs STATIC ${UUID_SRC} ${opennurbs_SOURCE})
+  endif()
+
+  # define ON_COMPILING_OPENNURBS to compile as a static library
+  target_compile_definitions(opennurbs PRIVATE ON_COMPILING_OPENNURBS)
+endif()
+
+# compile definitions
+target_compile_definitions(
+  opennurbs
+  PRIVATE
+    OPENNURBS_INPUT_LIBS_DIR="${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>"
+    UNICODE)
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  # Windows specific
+
+  # Fix "WIN32" preprocessor definitions on x64
+  if(${CMAKE_SIZEOF_VOID_P} EQUAL "8")
+    message(STATUS "Removing WIN32 definition for 64 bit build of opennurbs")
+    string(REPLACE "/DWIN32" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    target_compile_definitions(opennurbs PRIVATE WIN64)
+  endif()
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  # Linux specific
+
+  # Linux compiler definitions
+  target_compile_definitions(opennurbs PRIVATE ON_RUNTIME_LINUX)
+endif()
+
+if(CMAKE_CXX_COMPILER_ID MATCHES ".*Clang")
+  target_compile_definitions(opennurbs PRIVATE ON_COMPILER_CLANG)
+endif()
+
+# Dependencies
+
+# zlib
+option({OPENNURBS_EXTERNAL_ZLIB, "use external zlib package" OFF)
+if(${OPENNURBS_EXTERNAL_ZLIB} OR ${OPENNURBS_ZLIB_LIB_DIR})
+  message(STATUS "Using external ZLIB")
+  find_package(ZLIB REQUIRED)
+  target_link_libraries(opennurbs PRIVATE ZLIB::ZLIB)
+  target_compile_definitions(ZLIB::ZLIB PRIVATE MY_ZCALLOC Z_PREFIX)
+  get_target_property(OPENNURBS_ZLIB_LIB_DIR ZLIB::ZLIB
+                      LIBRARY_OUTPUT_DIRECTORY)
+  target_compile_definitions(
+    opennurbs PRIVATE OPENNURBS_ZLIB_LIB_DIR="${OPENNURBS_ZLIB_LIB_DIR}")
+else()
+  # build zlib (bundled with opennurbs)
+  file(GLOB ZLIB_SOURCE "${CMAKE_SOURCE_DIR}/zlib/*.h"
+       "${CMAKE_SOURCE_DIR}/zlib/*.c")
+  add_library(zlib ${ZLIB_SOURCE})
+  target_compile_definitions(zlib PRIVATE MY_ZCALLOC Z_PREFIX)
+  set_target_properties(
+    zlib PROPERTIES ARCHIVE_OUTPUT_DIRECTORY
+                    "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>")
+  set(opennurbs_ZLIB_LIB_DIR "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>")
+  target_compile_definitions(
+    opennurbs PRIVATE opennurbs_ZLIB_LIB_DIR=${opennurbs_ZLIB_LIB_DIR})
+  target_link_libraries(opennurbs PRIVATE zlib)
+endif()
+# zlib-specific flags for opennurbs
+target_compile_definitions(opennurbs PRIVATE MY_ZCALLOC Z_PREFIX)
+
+# shlwapi on windows
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  target_link_libraries(opennurbs PRIVATE shlwapi)
+endif()
+
+# cross_dirent
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  find_path(DIRENT_INCLUDE_DIR dirent.h)
+  if(${DIRENT_INCLUDE_DIR_FOUND})
+    target_include_directories(opennurbs PRIVATE ${DIRENT_INCLUDE_DIR_FOUND})
+  else()
+    file(DOWNLOAD https://github.com/tronkko/dirent/raw/1.23.2/include/dirent.h
+         ${CMAKE_CURRENT_BINARY_DIR}/_deps/dirent/include/dirent.h)
+    target_include_directories(
+      opennurbs PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/_deps/dirent/include/")
+  endif()
+endif()
+
+# uuid with clang on non-linux, android, windows
+if(NOT CMAKE_SYSTEM_NAME STREQUAL "Linux"
+   AND NOT CMAKE_SYSTEM_NAME STREQUAL "Windows"
+   AND CMAKE_CXX_COMPILER_ID MATCHES ".*Clang")
+  # uuid/uuid.h is required by opennurbs
+  message(STATUS "Finding uuid library")
+  find_package(UUID QUIET)
+  if(${UUID_FOUND})
+    target_include_directories(opennurbs PRIVATE ${UUID_INCLUDE_DIRS})
+  else()
+    # find uuid manually
+    if(NOT UUID_INCLUDE_DIR)
+      find_path(UUID_INCLUDE_DIR uuid/uuid.h)
+    endif()
+    if(EXISTS "${UUID_INCLUDE_DIR}")
+      include(CheckCXXSymbolExists)
+
+      set(UUID_INCLUDE_DIRS ${UUID_INCLUDE_DIR})
+      set(CMAKE_REQUIRED_INCLUDES ${UUID_INCLUDE_DIRS})
+      check_cxx_symbol_exists("uuid_generate_random" "uuid/uuid.h"
+                              _uuid_header_only)
+      if(NOT _uuid_header_only AND NOT UUID_LIBRARY)
+        include(CheckLibraryExists)
+        check_library_exists("uuid" "uuid_generate_random" "" _have_libuuid)
+        if(_have_libuuid)
+          set(UUID_LIBRARY "uuid")
+        endif()
+      endif()
+    endif()
+
+    if(UUID_LIBRARY)
+      set(UUID_LIBRARIES ${UUID_LIBRARY})
+    endif()
+
+    unset(CMAKE_REQUIRED_INCLUDES)
+
+    include(FindPackageHandleStandardArgs)
+    find_package_handle_standard_args(uuid DEFAULT_MSG UUID_INCLUDE_DIR)
+
+    # finally include it
+    target_include_directories(opennurbs PRIVATE ${UUID_INCLUDE_DIRS})
+  endif()
+endif()
+
+# OpenGL
+if(${OPENGL_FOUND})
+  target_link_libraries(opennurbs PRIVATE OpenGL::GL OpenGL::GLU)
+endif()
+
+# Suppress -Wdefaulted-function-deleted on Clang
+if(CMAKE_CXX_COMPILER_ID MATCHES ".*Clang")
+  # TODO fix this
+  message(WARNING "Suppressing -Wdefaulted-function-deleted for opennurbs")
+  target_compile_options(opennurbs PRIVATE -Wno-defaulted-function-deleted)
+endif()
+
+# Set the outputs of opennurbs CMake
+set(opennurbs_LIBRARY ${opennurbs})
+set(opennurbs_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}")
diff --git a/README.md b/README.md
index d86b8177..93e722cf 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,54 @@ Please see ["Getting started"](https://developer.rhino3d.com/guides/opennurbs/ge
 
 There's also a collection of [example 3dm files](example_files/) available for testing.
 
+## Building Using CMake:
+
+1. Clone the repository 
+2. `cd` to the root directory of the repository.
+3. Run the following to configure the CMake files.
+```
+cmake -S ./ -B ./build -DCMAKE_FIND_FRAMEWORK=LAST
+```
+   
+   Note: if [ninja-build](https://ninja-build.org/) is installed, you can specify `Ninja` to speed up the build:
+   ```
+    cmake -S ./ -B ./build -G "Ninja Multi-Config" -DCMAKE_FIND_FRAMEWORK=LAST
+   ```
+   
+   Note: To use Ninja with the Visual Studio Compiler, open the MSVC command prompt (or run `vcvarsall.bat`), and run:
+   ```
+    cmake -S ./ -B ./build -G "Ninja Multi-Config" -D CMAKE_CXX_COMPILER=cl -D CMAKE_C_COMPILER=cl
+   ```
+
+   Note: `-DCMAKE_FIND_FRAMEWORK=LAST` fixes the issue of the MacOS compilers that choose an incorrect framework to build system headers.
+
+   Note: Additionally, pass `-A ARM64` to build for ARM64. 
+
+4. Finally, run the following to build the library.
+```
+cmake --build ./build --config Release
+```
+
+### Build as a shared library with CMake 
+
+To build as a DLL with Visual Studio, you should add `-DOPENNURBS_SHARED=ON` to the command of step `3`:
+```
+cmake -S ./ -B ./build -DOPENNURBS_SHARED=ON
+```
+
+or with Ninja
+```
+cmake -S ./ -B ./build -G "Ninja Multi-Config" -D CMAKE_CXX_COMPILER=cl -D CMAKE_C_COMPILER=cl -DOPENNURBS_SHARED=ON
+```
+
+Build as usual as we described in step 4.
+
+When using the dll, define `OPENNURBS_IMPORTS` before including `opennurbs_public.h`
+```cmake
+target_compile_definitions(main PUBLIC OPENNURBS_IMPORTS)
+```
+
+
 ## Questions?
 
 For technical support, please head over to [Discourse](https://discourse.mcneel.com/category/opennurbs).
diff --git a/opennurbs_locale.cpp b/opennurbs_locale.cpp
index 45c46a5b..92e50e19 100644
--- a/opennurbs_locale.cpp
+++ b/opennurbs_locale.cpp
@@ -1343,7 +1343,7 @@ class ON_CRT_LOCALE
 
   static bool Validate_sprintf_l()
   {
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
     // Test formatted printing
     char buffer[64] = { 0 };
@@ -1368,7 +1368,7 @@ class ON_CRT_LOCALE
 
   static bool Validate_sprintf_s_l()
   {
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
     // Test formatted printing
     char buffer[64] = { 0 };
@@ -1422,7 +1422,7 @@ class ON_CRT_LOCALE
 
   static bool Validate_sscanf_l()
   {
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
     // Test formatted scanning
     double a = ON_UNSET_VALUE;
@@ -1447,7 +1447,7 @@ class ON_CRT_LOCALE
 
   static bool Validate_sscanf_s_l()
   {
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
     // Test formatted scanning
     double a = ON_UNSET_VALUE;
diff --git a/opennurbs_string_format.cpp b/opennurbs_string_format.cpp
index 304b351e..8dd6e158 100644
--- a/opennurbs_string_format.cpp
+++ b/opennurbs_string_format.cpp
@@ -803,7 +803,7 @@ int ON_String::FormatVargsIntoBuffer(
   if (0 == buffer || buffer_capacity <= 0)
     return -1;
   buffer[0] = 0;
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
   // CLang modifies args so a copy is required
   va_list args_copy;
   va_copy (args_copy, args);
@@ -854,7 +854,7 @@ int ON_String::FormatVargsOutputCount(
   if ( nullptr == format || 0 == format[0] )
     return 0;
 
-#if defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_COMPILER_GNU)) && !defined(ON_RUNTIME_WIN)
   // CLang modifies args so a copy is required
   va_list args_copy;
   va_copy (args_copy, args);
diff --git a/opennurbs_string_scan.cpp b/opennurbs_string_scan.cpp
index 34df9069..efe90f93 100644
--- a/opennurbs_string_scan.cpp
+++ b/opennurbs_string_scan.cpp
@@ -85,7 +85,7 @@ int ON_String::ScanBufferVargs(
   va_list args
   )
 {
-#if defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
   if (nullptr == buffer || nullptr == format)
     return -1;
@@ -398,7 +398,7 @@ const char* ON_String::ToNumber(
   local_buffer[local_buffer_count++] = 0;
 
   double x = value_on_failure;
-#if defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
   if (1 == sscanf(local_buffer, "%lg", &x))
   {
@@ -660,7 +660,7 @@ const wchar_t* ON_wString::ToNumber(
   local_buffer[local_buffer_count++] = 0;
 
   double x = value_on_failure;
-#if defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)
+#if (defined(ON_COMPILER_CLANG) || defined(ON_RUNTIME_LINUX)) && !defined(ON_RUNTIME_WIN)
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
   if (1 == sscanf(local_buffer, "%lg", &x))
   {
diff --git a/opennurbs_system.h b/opennurbs_system.h
index 504fea2f..a92eb9a8 100644
--- a/opennurbs_system.h
+++ b/opennurbs_system.h
@@ -542,6 +542,8 @@ typedef ON__UINT32 wchar_t;
 #pragma ON_PRAGMA_WARNING_BEFORE_DIRTY_INCLUDE
 #if defined(ON_RUNTIME_ANDROID) || defined(ON_RUNTIME_LINUX)
 #include "android_uuid/uuid.h"
+#elif defined(ON_RUNTIME_WIN)
+#include <Rpc.h>
 #else
 #include <uuid/uuid.h>
 #endif