--- a/hslua.cabal
+++ b/hslua.cabal
@@ -31,7 +31,7 @@
 
 flag system-lua
   description:          Use the system-wide Lua instead of the bundled copy
-  default:              False
+  default:              True
 
 flag apicheck
   description:          Compile Lua with -DLUA_USE_APICHECK.
@@ -39,7 +39,7 @@
 
 flag luajit
   description:          Link with LuaJIT (should be used with -fsystem-lua)
-  default:              False
+  default:              True
 
 library
   build-depends:        base == 4.*, bytestring >= 0.10.2.0 && < 0.11
@@ -48,10 +48,9 @@
   ghc-options:          -Wall -O2
   if flag(system-lua)
     if flag(luajit)
-      Extra-libraries:  luajit-5.1
+      Pkgconfig-depends:  lua5.1, luajit
     else
-      Extra-libraries:  lua
-    includes:           lua.h
+      Pkgconfig-depends:  lua5.1
   else
     c-sources:          lua-5.1.5/lobject.c, lua-5.1.5/ltm.c, lua-5.1.5/ldblib.c,
                         lua-5.1.5/ldo.c, lua-5.1.5/lvm.c, lua-5.1.5/ltable.c,