diff --git a/make.scm b/make.scm
index 329f0b44..af2b0843 100755
--- a/make.scm
+++ b/make.scm
@@ -418,7 +418,6 @@ exec ${GUILE-guile} --no-auto-compile -L . -L guile -C . -C guile -s "$0" ${1+"$
 (add-target (bin.gcc "src/mes.c" #:dependencies gcc-snarf-targets
                      #:defines `("MES_C_READER=1"
                                  "MES_C_DEFINE=1"
-                                 "MES_ARRAY_STACK=1"
                                  "MES_FIXED_PRIMITIVES=1"
                                  "MES_FULL=1"
                                  "POSIX=1"
@@ -431,7 +430,6 @@ exec ${GUILE-guile} --no-auto-compile -L . -L guile -C . -C guile -s "$0" ${1+"$
                      #:dependencies mes-snarf-targets
                      #:defines `("MES_C_READER=1"
                                  "MES_C_DEFINE=1"
-                                 "MES_ARRAY_STACK=1"
                                  "MES_FIXED_PRIMITIVES=1"
                                  "MES_FULL=1"
                                  ,(string-append "VERSION=\"" %version "\"")
@@ -442,7 +440,6 @@ exec ${GUILE-guile} --no-auto-compile -L . -L guile -C . -C guile -s "$0" ${1+"$
 (add-target (bin.mescc "src/mes.c" #:dependencies mes-snarf-targets
                        #:defines `("MES_C_READER=1"
                                    "MES_C_DEFINE=1"
-                                   "MES_ARRAY_STACK=1"
                                    "MES_FIXED_PRIMITIVES=1"
                                    "MES_FULL=1"
                                    ,(string-append "VERSION=\"" %version "\"")
diff --git a/module/mes/fluids.mes b/module/mes/fluids.mes
index 78d14db2..87dc4307 100644
--- a/module/mes/fluids.mes
+++ b/module/mes/fluids.mes
@@ -58,10 +58,6 @@
                                    (set! v (car rest))))) ',module)
            ',fluid))))
 
-(define-macro (make-fluid . default)
-  (core:display "FIXME: disabled fluids\n")
-  (lambda (x) x))
-
 (define (fluid-ref fluid)
   (fluid))
 
diff --git a/src/gc.c b/src/gc.c
index 0b102f1d..e140b499 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -125,15 +125,8 @@ gc_loop (SCM scan) ///((internal))
 SCM
 gc_check ()
 {
-#if !MES_ARRAY_STACK
   if (g_free + GC_SAFETY > ARENA_SIZE)
     gc_pop_frame (gc (gc_push_frame ()));
-#else
-#endif
-  if (g_free + GC_SAFETY > ARENA_SIZE)
-    {
-      gc ();
-    }
   return cell_unspecified;
 }
 
@@ -155,8 +148,6 @@ gc ()
     gc_copy (i);
   make_tmps (g_news);
   g_symbols = gc_copy (g_symbols);
-
-#if !MES_ARRAY_STACK
   SCM new = gc_copy (g_stack);
   if (g_debug > 1)
     {
@@ -165,8 +156,5 @@ gc ()
       eputs ("\n");
     }
   g_stack = new;
-#else
-#endif
-
   return gc_loop (1);
 }
diff --git a/src/mes.c b/src/mes.c
index c1d3470d..f89490e7 100644
--- a/src/mes.c
+++ b/src/mes.c
@@ -30,9 +30,6 @@ int ARENA_SIZE = 10000000;
 int ARENA_SIZE = 100000;
 #endif
 int MAX_ARENA_SIZE = 20000000;
-#if MES_ARRAY_STACK
-int STACK_SIZE = 10000;
-#endif
 
 //int GC_SAFETY_DIV = 400;
 //int GC_SAFETY = ARENA_SIZE / 400;
@@ -47,7 +44,6 @@ int g_free = 0;
 SCM g_continuations = 0;
 SCM g_symbols = 0;
 SCM g_stack = 0;
-SCM *g_stack_array = 0;
 // a/env
 SCM r0 = 0;
 // param 1
@@ -588,52 +584,9 @@ check_apply (SCM f, SCM e) ///((internal))
 SCM
 gc_push_frame () ///((internal))
 {
-#if !MES_ARRAY_STACK
   SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
   g_stack = cons (frame, g_stack);
   return g_stack;
-#else
-  if (g_stack < 4)
-    assert (!"STACK FULL");
-  g_stack_array[--g_stack] = r0;
-  g_stack_array[--g_stack] = r1;
-  g_stack_array[--g_stack] = r2;
-  g_stack_array[--g_stack] = r3;
-  return g_stack;
-#endif
-}
-
-SCM
-gc_peek_frame () ///((internal))
-{
-#if !MES_ARRAY_STACK
-  SCM frame = CAR (g_stack);
-  r1 = CAR (frame);
-  r2 = CADR (frame);
-  r3 = CAR (CDDR (frame));
-  r0 = CADR (CDDR (frame));
-  return frame;
-#else
-  r3 = g_stack_array[g_stack];
-  r2 = g_stack_array[g_stack+1];
-  r1 = g_stack_array[g_stack+2];
-  r0 = g_stack_array[g_stack+3];
-  return r0;
-#endif
-}
-
-SCM
-gc_pop_frame () ///((internal))
-{
-#if !MES_ARRAY_STACK
-  SCM frame = gc_peek_frame ();
-  g_stack = CDR (g_stack);
-  return frame;
-#else
-  gc_peek_frame ();
-  g_stack += 4;
-  return r0;
-#endif
 }
 
 SCM
@@ -778,6 +731,25 @@ push_cc (SCM p1, SCM p2, SCM a, SCM c) ///((internal))
   return cell_unspecified;
 }
 
+SCM
+gc_peek_frame () ///((internal))
+{
+  SCM frame = CAR (g_stack);
+  r1 = CAR (frame);
+  r2 = CADR (frame);
+  r3 = CAR (CDDR (frame));
+  r0 = CADR (CDDR (frame));
+  return frame;
+}
+
+SCM
+gc_pop_frame () ///((internal))
+{
+  SCM frame = gc_peek_frame (g_stack);
+  g_stack = CDR (g_stack);
+  return frame;
+}
+
 SCM
 eval_apply ()
 {
@@ -1157,22 +1129,12 @@ apply (SCM f, SCM x, SCM a) ///((internal))
 SCM
 mes_g_stack (SCM a) ///((internal))
 {
-#if !MES_ARRAY_STACK
   r0 = a;
   r1 = MAKE_CHAR (0);
   r2 = MAKE_CHAR (0);
   r3 = MAKE_CHAR (0);
   g_stack = cons (cell_nil, cell_nil);
   return r0;
-#else
-  //g_stack = g_free + ARENA_SIZE;
-  g_stack = STACK_SIZE;
-  r0 = a;
-  r1 = MAKE_CHAR (0);
-  r2 = MAKE_CHAR (0);
-  r3 = MAKE_CHAR (0);
-  return r0;
-#endif
 }
 
 // Environment setup
@@ -1200,9 +1162,6 @@ SCM
 gc_init_cells () ///((internal))
 {
   g_cells = (struct scm *)malloc (2*ARENA_SIZE*sizeof (struct scm));
-#if MES_ARRAY_STACK
-  g_stack_array = (SCM *)malloc (STACK_SIZE);
-#endif
 
   TYPE (0) = TVECTOR;
   LENGTH (0) = 1000;
@@ -1507,7 +1466,6 @@ main (int argc, char *argv[])
   if (g_debug) {eputs (";;; MODULEDIR=");eputs (MODULEDIR);eputs ("\n");}
   if (p = getenv ("MES_MAX_ARENA")) MAX_ARENA_SIZE = atoi (p);
   if (p = getenv ("MES_ARENA")) ARENA_SIZE = atoi (p);
-  if (p = getenv ("MES_STACK")) STACK_SIZE = atoi (p);
   if (argc > 1 && !strcmp (argv[1], "--help")) return puts ("Usage: mes [--dump|--load] < FILE\n");
   if (argc > 1 && !strcmp (argv[1], "--version")) {puts ("Mes ");puts (VERSION);puts ("\n");return 0;};
   g_stdin = STDIN;
@@ -1533,7 +1491,7 @@ main (int argc, char *argv[])
   r1 = eval_apply ();
   display_error_ (r1);
   eputs ("\n");
-  gc ();
+  gc (g_stack);
   if (g_debug)
     {
       eputs ("\nstats: [");