diff --git a/src/raylua_builder.c b/src/raylua_builder.c
index a3b7d99..1c56238 100644
--- a/src/raylua_builder.c
+++ b/src/raylua_builder.c
@@ -102,6 +102,19 @@ static int raylua_builder_new(lua_State *L)
   return 1;
 }
 
+static int raylua_builder_set_executable(lua_State *L)
+{
+  const char *path = luaL_checkstring(L, -1);
+  printf("BUILDER: Sets '%s' executable.\n", path);
+
+  #ifndef WIN32
+  /* On Windows, there is no need to set a executable flag. */
+  chmod(path, 0777); /* rwx */
+  #endif
+
+  return 0;
+}
+
 static int raylua_builder_close(lua_State *L)
 {
   raylua_builder *builder = lua_touserdata(L, -1);
@@ -193,6 +206,9 @@ int raylua_builder_boot(lua_State *L)
   lua_pushcfunction(L, raylua_builder_add);
   lua_setglobal(L, "builder_add");
 
+  lua_pushcfunction(L, raylua_builder_set_executable);
+  lua_setglobal(L, "set_executable");
+
   if (luaL_dostring(L, raylua_builder_lua))
     fputs(luaL_checkstring(L, -1), stderr);
 
diff --git a/src/raylua_builder.lua b/src/raylua_builder.lua
index 8e15316..ee27c80 100644
--- a/src/raylua_builder.lua
+++ b/src/raylua_builder.lua
@@ -67,6 +67,8 @@ end
 print("BUILDER: Self is " .. self_path)
 
 if t == "directory" then
+  print "BUILDER: Building from folder."
+
   local output = arg[2]
 
   if not output then
@@ -75,7 +77,7 @@ if t == "directory" then
     if ffi.os == "Windows" then
       output = input_path .. ".exe"
     else
-      output = input_path .. ".elf"
+      output = input_path .. "_out"
     end
   end
 
@@ -125,6 +127,7 @@ if t == "directory" then
   end
 
   builder_close(builder)
+  set_executable(output)
 elseif t == "file" then
   local ext = input_path:sub(-4)
 
@@ -134,7 +137,7 @@ elseif t == "file" then
   if ffi.os == "Windows" then
     path = path .. ".exe"
   else
-    path = path .. ".elf"
+    path = path .. "_out"
   end
 
   print("BUILDER: Building " .. path)
@@ -157,7 +160,11 @@ elseif t == "file" then
     local builder = builder_new(self_path, path)
     builder_add(builder, input_path, "main.lua")
     builder_close(builder)
+  else
+    error "Unknown file type."
   end
+
+  set_executable(path)
 end
 
 print "BUILDER: Done"