From 8f362f99582db3842a01cb703e0ca9dac3adb3d9 Mon Sep 17 00:00:00 2001
From: Hisham Muhammad <hisham@gobolinux.org>
Date: Fri, 26 Jul 2019 16:25:50 -0300
Subject: only check for LUA_LIBDIR in platforms that need it

---
 src/luarocks/core/cfg.lua |  1 +
 src/luarocks/deps.lua     | 50 +++++++++++++++++++++++++----------------------
 2 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/src/luarocks/core/cfg.lua b/src/luarocks/core/cfg.lua
index c50e0a44..8edd5f63 100644
--- a/src/luarocks/core/cfg.lua
+++ b/src/luarocks/core/cfg.lua
@@ -356,6 +356,7 @@ local function make_defaults(lua_version, target_cpu, platforms, home)
          lib = { "cyg?.dll", "?.dll", "lib?.dll" },
          include = { "?.h" }
       }
+      defaults.link_lua_explicitly = true
    end
 
    if platforms.unix then
diff --git a/src/luarocks/deps.lua b/src/luarocks/deps.lua
index 874787da..9ea14881 100644
--- a/src/luarocks/deps.lua
+++ b/src/luarocks/deps.lua
@@ -532,35 +532,39 @@ local function find_lua_incdir(prefix, luaver, luajitver)
 end
 
 function deps.check_lua(vars)
-   local incdir_found = true
    local ljv = util.get_luajit_version()
+
    if (not vars.LUA_INCDIR) and vars.LUA_DIR then
       vars.LUA_INCDIR = find_lua_incdir(vars.LUA_DIR, cfg.lua_version, ljv)
-      incdir_found = (vars.LUA_INCDIR ~= nil)
-   end
-   local shortv = cfg.lua_version:gsub("%.", "")
-   local libnames = {
-      "lua" .. cfg.lua_version,
-      "lua" .. shortv,
-      "lua-" .. cfg.lua_version,
-      "lua-" .. shortv,
-      "lua",
-   }
-   if ljv then
-      table.insert(libnames, 1, "luajit-" .. cfg.lua_version)
-   end
-   local cache = {}
-   for _, libname in ipairs(libnames) do
-      local ok = check_external_dependency("LUA", { library = libname }, vars, "build", cache)
-      if ok then
-         vars.LUALIB = vars.LUA_LIBDIR_FILE
-         return true
+      if vars.LUA_INCDIR == nil then
+         return nil, "Failed finding Lua header files. You may need to install them or configure LUA_INCDIR.", "dependency"
       end
    end
-   if not incdir_found then
-      return nil, "Failed finding Lua header files. You may need to install them or configure LUA_INCDIR.", "dependency"
+
+   if cfg.link_lua_explicitly then
+      local shortv = cfg.lua_version:gsub("%.", "")
+      local libnames = {
+         "lua" .. cfg.lua_version,
+         "lua" .. shortv,
+         "lua-" .. cfg.lua_version,
+         "lua-" .. shortv,
+         "lua",
+      }
+      if ljv then
+         table.insert(libnames, 1, "luajit-" .. cfg.lua_version)
+      end
+      local cache = {}
+      for _, libname in ipairs(libnames) do
+         local ok = check_external_dependency("LUA", { library = libname }, vars, "build", cache)
+         if ok then
+            vars.LUALIB = vars.LUA_LIBDIR_FILE
+            return true
+         end
+      end
+      return nil, "Failed finding Lua library. You may need to configure LUA_LIBDIR.", "dependency"
    end
-   return nil, "Failed finding Lua library. You may need to configure LUA_LIBDIR.", "dependency"
+   
+   return true
 end
 
 local valid_deps_modes = {
-- 
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