diff --git a/polymer/eduke32/source/lunatic/control.lua b/polymer/eduke32/source/lunatic/control.lua
index 384f5d939..9a2b449a4 100644
--- a/polymer/eduke32/source/lunatic/control.lua
+++ b/polymer/eduke32/source/lunatic/control.lua
@@ -54,6 +54,9 @@ local check_sound_idx = bcheck.sound_idx
 local check_number = bcheck.number
 local check_type = bcheck.type
 
+local lprivate = require("lprivate")
+local GET, WEAPON = lprivate.GET, lprivate.WEAPON
+
 local OUR_REQUIRE_STRING = [[
  local _con=require'con'
  local _ga,_av,_pv=_con._gamearray,_con.actorvar,_con.playervar
@@ -587,7 +590,7 @@ function _tossweapon(pli)  -- P_DropWeapon replacement
 
     if (krandand(1) ~= 0) then
         spawn(ffiC.WeaponPickupSprites[cw], ps.i)
-    elseif (cw==ffiC.RPG_WEAPON or cw==ffiC.HANDBOMB_WEAPON) then
+    elseif (cw==WEAPON.RPG or cw==WEAPON.HANDBOMB) then
         if (D.EXPLOSION2 ~= nil) then
             spawn(D.EXPLOSION2, ps.i)
         end
@@ -606,7 +609,7 @@ end
 local function P_AddWeaponAmmoCommon(ps, weap, amount)
     P_AddAmmo(ps, weap, amount)
 
-    if (ps.curr_weapon==ffiC.KNEE_WEAPON and ps:has_weapon(weap)) then
+    if (ps.curr_weapon==WEAPON.KNEE and ps:has_weapon(weap)) then
         CF.P_AddWeaponMaybeSwitchI(ps.weapon._p, weap);
     end
 end
@@ -1112,17 +1115,17 @@ end
 
 local PALBITS = { [0]=1, [21]=2, [23]=4 }
 local ICONS = {
-    [ffiC.GET_FIRSTAID] = 1,  -- ICON_FIRSTAID
-    [ffiC.GET_STEROIDS] = 2,
-    [ffiC.GET_HOLODUKE] = 3,
-    [ffiC.GET_JETPACK] = 4,
-    [ffiC.GET_HEATS] = 5,
-    [ffiC.GET_SCUBA] = 6,
-    [ffiC.GET_BOOTS] = 7,
+    [GET.FIRSTAID] = 1,  -- ICON_FIRSTAID
+    [GET.STEROIDS] = 2,
+    [GET.HOLODUKE] = 3,
+    [GET.JETPACK] = 4,
+    [GET.HEATS] = 5,
+    [GET.SCUBA] = 6,
+    [GET.BOOTS] = 7,
 }
 
 function _addinventory(ps, inv, amount, i)
-    if (inv == ffiC.GET_ACCESS) then
+    if (inv == GET.ACCESS) then
         local pal = sprite[i].pal
         if (PALBITS[pal]) then
             ps.got_access = bor(ps.got_access, PALBITS[pal])
@@ -1132,7 +1135,7 @@ function _addinventory(ps, inv, amount, i)
             ps.inven_icon = ICONS[inv]
         end
 
-        if (inv == ffiC.GET_SHIELD) then
+        if (inv == GET.SHIELD) then
             amount = math.min(ps.max_shield_amount, amount)
         end
         -- NOTE: this is more permissive than CON, e.g. allows
@@ -1142,9 +1145,9 @@ function _addinventory(ps, inv, amount, i)
 end
 
 function _checkpinventory(ps, inv, amount, i)
-    if (inv==ffiC.GET_SHIELD) then
+    if (inv==GET.SHIELD) then
         return ps.inv_amount[inv] ~= ps.max_shield_amount
-    elseif (inv==ffiC.GET_ACCESS) then
+    elseif (inv==GET.ACCESS) then
         local palbit = PALBITS[sprite[i].pal]
         return palbit and (band(ps.got_access, palbit)~=0)
     else
@@ -1153,13 +1156,13 @@ function _checkpinventory(ps, inv, amount, i)
 end
 
 local INV_SELECTION_ORDER = {
-    ffiC.GET_FIRSTAID,
-    ffiC.GET_STEROIDS,
-    ffiC.GET_JETPACK,
-    ffiC.GET_HOLODUKE,
-    ffiC.GET_HEATS,
-    ffiC.GET_SCUBA,
-    ffiC.GET_BOOTS,
+    GET.FIRSTAID,
+    GET.STEROIDS,
+    GET.JETPACK,
+    GET.HOLODUKE,
+    GET.HEATS,
+    GET.SCUBA,
+    GET.BOOTS,
 }
 
 -- checkavailinven CON command
@@ -1618,7 +1621,7 @@ function _ifp(flags, pli, aci)
         return true
     elseif (band(l,256)~=0 and vel <= -8 and holdskey(pli, "RUN")) then
         return true
-    elseif (band(l,512)~=0 and (ps.quick_kick > 0 or (ps.curr_weapon == ffiC.KNEE_WEAPON and ps.kickback_pic > 0))) then
+    elseif (band(l,512)~=0 and (ps.quick_kick > 0 or (ps.curr_weapon == 0 and ps.kickback_pic > 0))) then
         return true
     elseif (band(l,1024)~=0 and sprite[ps.i].xrepeat < 32) then
         return true
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index 77f6d8b4a..7ce897072 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -106,18 +106,14 @@ local WEAPON_NAMES = {
 }
 
 ---- game structs ----
+
+lprivate.GET = defs_c.conststruct(INV_NAMES)
+lprivate.WEAPON = defs_c.conststruct(WEAPON_NAMES)
+
 ffi.cdef([[
-enum dukeinv_t {
-]].. "GET_"..table.concat(INV_NAMES, ",GET_") ..[[,
-    GET_MAX
-};
-
-enum dukeweapon_t {
-]].. table.concat(WEAPON_NAMES, "_WEAPON,").."_WEAPON," ..[[
-    MAX_WEAPONS
-};
-
 enum {
+    GET_MAX = 11,
+    MAX_WEAPONS = 12,
     MAXPLAYERS = 16,
     GTICSPERSEC = 30,  // The real number of movement updates per second
 };
@@ -585,7 +581,7 @@ ffi.cdef[[
 const int32_t screenpeek;
 hudweapon_t hudweap;
 int32_t g_logoFlags;
-int32_t g_RETURN;  // deprecated from Lua
+int32_t g_RETURN;
 ]]
 
 -- INTERNAL VARIABLES/FUNCTIONS
@@ -1492,6 +1488,9 @@ gv_access.REND = defs_c.conststruct
     POLYMER = 4,
 }
 
+gv_access.WEAPON = lprivate.WEAPON
+gv_access.GET = lprivate.GET
+
 function gv_access._get_yxaspect()
     return ffiC.yxaspect
 end
@@ -2364,7 +2363,7 @@ local tmpmt = {
 
     __newindex = function(_, key, val)
         if (gv_access[key] == nil) then
-            -- Read-only vars handled by LuaJIT.
+            -- Variables declared 'const' are handled by LuaJIT.
             ffiC[key] = val
         else
             error("write access forbidden", 2)
diff --git a/polymer/eduke32/source/lunatic/defs_common.lua b/polymer/eduke32/source/lunatic/defs_common.lua
index 362c1ba7c..f06ed80d2 100644
--- a/polymer/eduke32/source/lunatic/defs_common.lua
+++ b/polymer/eduke32/source/lunatic/defs_common.lua
@@ -803,8 +803,16 @@ end
 function conststruct(tab)
     local strtab = { "struct {" }
 
-    for member, val in pairs(tab) do
-        strtab[#strtab+1] = "static const int "..member.."="..val..";"
+    if (tab[1] ~= nil) then
+        -- e.g. { "KNEE", "PISTOL", ... } provided
+        for i=1,#tab do
+            strtab[#strtab+1] = "static const int "..tab[i].."="..(i-1)..";"
+        end
+    else
+        -- e.g. { KNEE=0, PISTOL=1, ... } provided
+        for member, val in pairs(tab) do
+            strtab[#strtab+1] = "static const int "..member.."="..val..";"
+        end
     end
     strtab[#strtab+1] = "}"
 
diff --git a/polymer/eduke32/source/lunatic/test.lua b/polymer/eduke32/source/lunatic/test.lua
index e16a5c3d6..2889f8a8f 100644
--- a/polymer/eduke32/source/lunatic/test.lua
+++ b/polymer/eduke32/source/lunatic/test.lua
@@ -246,6 +246,7 @@ gameevent
 }
 
 local D = require("CON.DEFS")
+local WEAPON = gv.WEAPON
 
 -- test event chaining
 gameevent
@@ -264,7 +265,7 @@ gameevent
         else
             pistol.shoots = D.SHOTSPARK1
         end
-        ps.weapon[gv.PISTOL_WEAPON].firesound = D.LIGHTNING_SLAP
+        ps.weapon[WEAPON.PISTOL].firesound = D.LIGHTNING_SLAP
 
         -- This succeeds, because sound2time is a time, not a sound.
         ps.weapon.SHOTGUN.sound2time = 5000
@@ -336,11 +337,11 @@ gameevent
 
         local pl = player[0]
         -- MAX < current is "allowed"
-        pl.max_ammo_amount[gv.RPG_WEAPON] = 17
-        pl:give_weapon(gv.RPG_WEAPON)
-        pl.ammo_amount[gv.RPG_WEAPON] = 54
+        pl.max_ammo_amount[WEAPON.RPG] = 17
+        pl:give_weapon(WEAPON.RPG)
+        pl.ammo_amount[WEAPON.RPG] = 54
 
-        pl:give_weapon(gv.SHRINKER_WEAPON)
+        pl:give_weapon(WEAPON.SHRINKER)
         -- This looks much prettier:
         pl.ammo_amount.SHRINKER = 2
 
@@ -605,7 +606,7 @@ local function testbit(num, b)
 end
 
 local FADE_SPEED = {
-    [gv.KNEE_WEAPON] = 1/2.5,
+    [WEAPON.KNEE] = 1/2.5,
 
     1/128,
     1/5,
@@ -617,7 +618,7 @@ local FADE_SPEED = {
     5,
     127,  -- freezer; such a fast fade is not visible, but it clears any
           -- existing one (if of higher priority)
-    [gv.GROW_WEAPON] = 9.9,  -- test banker's rouding -- should be like 10
+    [WEAPON.GROW] = 9.9,  -- test banker's rouding -- should be like 10
 }
 
 -- Test player[]:fadecol(), a better palfrom.