1 files changed, 40 insertions, 20 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 521ce54..06edb6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,27 +1,8 @@
 cmake_minimum_required(VERSION 3.0.2)
+include(ExternalProject)
 
 project(emacs-libvterm C)
 
-# Look for the header file.
-find_path(LIBVTERM_INCLUDE_DIR NAMES
-  vterm.h
-  )
-
-if(NOT LIBVTERM_INCLUDE_DIR)
-  message(FATAL_ERROR "vterm.h not found")
-endif()
-
-find_library(LIBVTERM_LIBRARY NAMES
-  vterm
-  libvterm
-  )
-
-if(NOT LIBVTERM_LIBRARY)
-  message(FATAL_ERROR "libvterm not found")
-endif()
-
-include_directories(${LIBVTERM_INCLUDE_DIR})
-
 add_library(vterm-module MODULE vterm-module.c utf8.c elisp.c)
 set_target_properties(vterm-module PROPERTIES
   C_STANDARD 99
@@ -30,6 +11,45 @@ set_target_properties(vterm-module PROPERTIES
   LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}
   )
 
+# Look for the header file.
+option(USE_SYSTEM_LIBVTERM "Use system libvterm instead of the vendored version." OFF)
+
+if(USE_SYSTEM_LIBVTERM)
+  find_path(LIBVTERM_INCLUDE_DIR NAMES
+    vterm.h
+    )
+
+  if(NOT LIBVTERM_INCLUDE_DIR)
+    message(FATAL_ERROR "vterm.h not found")
+  endif()
+
+  find_library(LIBVTERM_LIBRARY NAMES
+    vterm
+    libvterm
+    )
+
+  if(NOT LIBVTERM_LIBRARY)
+    message(FATAL_ERROR "libvterm not found")
+  endif()
+else()
+  ExternalProject_add(libvterm
+    GIT_REPOSITORY https://github.com/neovim/libvterm.git
+    GIT_TAG a6293a0e033e7e86c74889b4527787993656883a
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND make "CFLAGS='-fPIC'"
+    BUILD_IN_SOURCE ON
+    INSTALL_COMMAND "")
+
+  ExternalProject_Get_property(libvterm SOURCE_DIR)
+
+  set(LIBVTERM_INCLUDE_DIR ${SOURCE_DIR}/include)
+  set(LIBVTERM_LIBRARY ${SOURCE_DIR}/.libs/libvterm.a)
+
+  add_dependencies(vterm-module libvterm)
+endif()
+
+include_directories(${LIBVTERM_INCLUDE_DIR})
+
 # Link with libvterm
 target_link_libraries(vterm-module ${LIBVTERM_LIBRARY})