diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30f0c66..d41be3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,19 +29,19 @@ if (NOT mstch_FOUND)
     include_directories(${source_dir}/include)
 endif()
 
-ExternalProject_Add(ext-docopt
-    GIT_REPOSITORY https://github.com/docopt/docopt.cpp
+ExternalProject_Add(ext-optparse
+    GIT_REPOSITORY https://github.com/weisslj/cpp-optparse
+    PATCH_COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/cmake/OptParse.cmakelists" "${CMAKE_CURRENT_BINARY_DIR}/ext-optparse-prefix/src/ext-optparse/CMakeLists.txt"
     INSTALL_COMMAND ""
     EXCLUDE_FROM_ALL 1
     )
 
-add_library(docopt IMPORTED STATIC GLOBAL)
-add_dependencies(docopt ext-docopt)
+add_library(cpp-optparse IMPORTED STATIC GLOBAL)
+add_dependencies(cpp-optparse ext-optparse)
 
-ExternalProject_Get_Property(ext-docopt source_dir binary_dir)
-set_target_properties(docopt PROPERTIES "IMPORTED_LOCATION" "${binary_dir}/${CMAKE_STATIC_LIBRARY_PREFIX}docopt${CMAKE_STATIC_LIBRARY_SUFFIX}")
+ExternalProject_Get_Property(ext-optparse source_dir binary_dir)
+set_target_properties(cpp-optparse PROPERTIES "IMPORTED_LOCATION" "${binary_dir}/${CMAKE_STATIC_LIBRARY_PREFIX}cpp-optparse${CMAKE_STATIC_LIBRARY_SUFFIX}")
 include_directories(${source_dir})
-
 ##########################################
 
 set(CMAKE_INSTALL_PREFIX "${CMAKE_CURRENT_BINARY_DIR}")
diff --git a/cmake/OptParse.cmakelists b/cmake/OptParse.cmakelists
new file mode 100644
index 0000000..7b41a74
--- /dev/null
+++ b/cmake/OptParse.cmakelists
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.2.2)
+project(cpp-optparse)
+
+add_library(cpp-optparse OptionParser.cpp)