diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0377b0b39..6471c9781 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -116,53 +116,6 @@ endif()
 
 option(INSTALL_PRIVATE_HEADERS "installs private headers in the same location as the public ones" OFF)
 
-if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
-  set(BlocksRuntime_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/src/BlocksRuntime)
-
-  # NOTE(compnerd) use the `BUILD_SHARED_LIBS` variable to determine what type
-  # of library to build.  If it is true, we will generate shared libraries,
-  # otherwise we will generate static libraries.
-  add_library(BlocksRuntime
-              ${PROJECT_SOURCE_DIR}/src/BlocksRuntime/data.c
-              ${PROJECT_SOURCE_DIR}/src/BlocksRuntime/runtime.c)
-  if(CMAKE_SYSTEM_NAME STREQUAL Windows)
-    target_sources(BlocksRuntime
-                   PRIVATE
-                     ${PROJECT_SOURCE_DIR}/src/BlocksRuntime/BlocksRuntime.def)
-    if(NOT BUILD_SHARED_LIBS)
-      target_compile_definitions(BlocksRuntime
-                                 PRIVATE
-                                   BlocksRuntime_STATIC)
-    endif()
-  endif()
-  set_target_properties(BlocksRuntime
-                        PROPERTIES
-                          POSITION_INDEPENDENT_CODE TRUE)
-  if(HAVE_OBJC AND CMAKE_DL_LIBS)
-    target_link_libraries(BlocksRuntime
-                          PUBLIC
-                            ${CMAKE_DL_LIBS})
-  endif()
-
-  add_library(BlocksRuntime::BlocksRuntime ALIAS BlocksRuntime)
-
-  install(FILES
-            ${PROJECT_SOURCE_DIR}/src/BlocksRuntime/Block.h
-          DESTINATION
-            "${INSTALL_BLOCK_HEADERS_DIR}")
-  if(INSTALL_PRIVATE_HEADERS)
-    install(FILES
-              ${PROJECT_SOURCE_DIR}/src/BlocksRuntime/Block_private.h
-            DESTINATION
-              "${INSTALL_BLOCK_HEADERS_DIR}")
-  endif()
-  install(TARGETS
-            BlocksRuntime
-          ARCHIVE DESTINATION ${INSTALL_TARGET_DIR}
-          LIBRARY DESTINATION ${INSTALL_TARGET_DIR}
-          RUNTIME DESTINATION bin)
-endif()
-
 check_symbol_exists(__GNU_LIBRARY__ "features.h" _GNU_SOURCE)
 if(_GNU_SOURCE)
   set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_GNU_SOURCE)
diff --git a/src/BlocksRuntime/CMakeLists.txt b/src/BlocksRuntime/CMakeLists.txt
new file mode 100644
index 000000000..a5388d6eb
--- /dev/null
+++ b/src/BlocksRuntime/CMakeLists.txt
@@ -0,0 +1,34 @@
+
+add_library(BlocksRuntime
+  data.c
+  runtime.c)
+if(CMAKE_SYSTEM_NAME STREQUAL Windows)
+  target_sources(BlocksRuntime PRIVATE
+    BlocksRuntime.def)
+
+  if(NOT BUILD_SHARED_LIBS)
+    target_compile_definitions(BlocksRuntime PRIVATE
+      BlocksRuntime_STATIC)
+  endif()
+endif()
+
+set_target_properties(BlocksRuntime PROPERTIES
+  POSITION_INDEPENDENT_CODE TRUE
+  INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR})
+if(HAVE_OBJC AND CMAKE_DL_LIBS)
+  target_link_libraries(BlocksRuntime PUBLIC
+    ${CMAKE_DL_LIBS})
+endif()
+
+add_library(BlocksRuntime::BlocksRuntime ALIAS BlocksRuntime)
+
+install(FILES Block.h
+        DESTINATION ${INSTALL_BLOCK_HEADERS_DIR})
+if(INSTALL_PRIVATE_HEADERS)
+  install(FILES Block_private.h
+          DESTINATION ${INSTALL_BLOCK_HEADERS_DIR})
+endif()
+install(TARGETS BlocksRuntime
+        ARCHIVE DESTINATION ${INSTALL_TARGET_DIR}
+        LIBRARY DESTINATION ${INSTALL_TARGET_DIR}
+        RUNTIME DESTINATION bin)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2809c11c9..58419d430 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,6 +3,8 @@ include(CheckCCompilerFlag)
 include(SwiftSupport)
 include(DTrace)
 
+add_subdirectory(BlocksRuntime)
+
 add_library(dispatch
               allocator.c
               apply.c