Document how to install test dependencies on ubuntu

Just a tip to save other devs a few minutes.

CMakeLists.txt

@@ -21,7 +21,7 @@ FOREACH(file Kyuafile libpkgconf.pc tests/Kyuafile tests/test_env.sh)
 ENDFOREACH()
 
 IF (WIN32)
-  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Wx")
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /WX")
 ELSE()
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wformat=2 -std=gnu99")
 ENDIF()

scripts/install_deps.sh

@@ -27,6 +27,11 @@
 #
 # This script is primarily intended for travis CI to be able to setup the
 # build environment.
+#
+# To run on a clean Ubuntu system, try something like this:
+#  export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
+#  sudo apt install liblua5.2-dev libsqlite3-dev
+#  sh -ex scripts/install_deps.sh 
 
 install_from_github() {
 	local name="${1}"