Compile in Lua support opportunistically

.travis.yml

@@ -28,6 +28,6 @@ before_script:
  - mkdir build
  - cd build
 script:
- - cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DWITH_LUA=OFF
+ - cmake .. -DCMAKE_INSTALL_PREFIX=/usr
  - make
  - cpack -G DEB

CMakeLists.txt

@@ -7,9 +7,6 @@ if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUC)
 	set (CMAKE_C_FLAGS "-std=c99 -Wall -Wextra -Wno-unused-function")
 endif ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUC)
 
-# Build options
-option (WITH_LUA "Enable experimental support for Lua 5.3 plugins" ON)
-
 # Version
 set (project_VERSION_MAJOR "0")
 set (project_VERSION_MINOR "1")
@@ -43,10 +40,12 @@ else (CURSES_FOUND)
 	message (SEND_ERROR "Curses not found")
 endif (ncursesw_FOUND)
 
-if (WITH_LUA)
 # FIXME: for "lua" we also need to check that it is < 5.4
 #   which doesn't seem to be possible with FindPkgConfig
 pkg_search_module (lua REQUIRED lua5.3 lua-5.3 lua>=5.3)
+option (WITH_LUA "Enable experimental support for Lua 5.3 plugins" ${lua_FOUND})
+
+if (WITH_LUA)
 	list (APPEND project_libraries ${lua_LIBRARIES})
 	include_directories (${lua_INCLUDE_DIRS})
 	link_directories (${lua_LIBRARY_DIRS})

README.adoc

@@ -23,7 +23,7 @@ Runtime dependenices: curses, openssl, Jansson, lua = 5.3 (optional)
  $ git clone --recursive https://github.com/pjanouch/ponymap.git
  $ mkdir ponymap/build
  $ cd ponymap/build
- $ cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug -DWITH_LUA=NO
+ $ cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug
  $ make
 
 To install the application, you can do either the usual: