diff --git a/GNUmakefile b/GNUmakefile
index ee72c6a3..3a2317db 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -98,6 +98,7 @@ module/mes/read-0.mo: module/mes/read-0.mes mes
 
 dump: module/mes/read-0.mo
 
+mes-32: gc.c lib.c math.c posix.c vector.c
 mes-32: mes.c lib.c
 	rm -f mes mes.o
 	guix environment --system=i686-linux --ad-hoc gcc-toolchain -- bash -c 'make mes CC=i686-unknown-linux-gnu-gcc LIBRARY_PATH=$${PATH%%/bin:*}/lib'
@@ -130,6 +131,7 @@ mescc-check: t-check
 
 mini-mes: mini-mes.h mini-mes.i mini-mes.environment.i mini-mes.symbols.i
 mini-mes: vector.c
+mini-mes: gc.c
 mini-mes: mlibc.c mstart.c
 mini-mes: GNUmakefile
 mini-mes: module/mes/read-0-32.mo
diff --git a/gc.c b/gc.c
index d257541d..2f197eda 100644
--- a/gc.c
+++ b/gc.c
@@ -21,12 +21,29 @@
 SCM
 gc_up_arena () ///((internal))
 {
+#if _POSIX_SOURCE
   ARENA_SIZE *= 2;
   void *p = realloc (g_cells-1, 2*ARENA_SIZE*sizeof(struct scm));
+#else
+  ARENA_SIZE = ARENA_SIZE * 2;
+  //p = realloc (g_cells-1, 2*ARENA_SIZE*sizeof(struct scm));
+  int size = ARENA_SIZE * 2;
+  size = size * 12;
+  char *p = size;
+  p = realloc (g_cells-1, size);
+  g_cells = p;
+#endif
+
+#if _POSIX_SOURCE
   if (!p) error (cell_symbol_system_error, cons (MAKE_STRING (cstring_to_list (strerror (errno))), MAKE_NUMBER (g_free)));
   g_cells = (struct scm*)p;
   g_cells++;
+#else
+  //assert (p);
+  //g_cells = (struct scm*)p;
+#endif
   gc_init_news ();
+  return 0;
 }
 
 SCM
@@ -35,7 +52,16 @@ gc_flip () ///((internal))
   struct scm *cells = g_cells;
   g_cells = g_news;
   g_news = cells;
+#if _POSIX_SOURCE
   if (g_debug) fprintf (stderr, " => jam[%d]\n", g_free);
+#else
+  if (g_debug)
+    {
+      eputs (" => jam[");
+      eputs (itoa (g_free));
+      eputs ("]\n");
+    }
+#endif
   return g_stack;
 }
 
@@ -47,12 +73,12 @@ gc_copy (SCM old) ///((internal))
   g_news[new] = g_cells[old];
   if (NTYPE (new) == TVECTOR)
     {
-      g_news[new].vector = g_free;
+      NVECTOR (new) = g_free;
       for (int i=0; i<LENGTH (old); i++)
         g_news[g_free++] = g_cells[VECTOR (old)+i];
     }
-  g_cells[old].type = TBROKEN_HEART;
-  g_cells[old].car = new;
+  TYPE (old) = TBROKEN_HEART;
+  CAR (old) = new;
   return new;
 }
 
@@ -108,7 +134,16 @@ gc_loop (SCM scan) ///((internal))
 SCM
 gc ()
 {
+#if _POSIX_SOURCE
   if (g_debug) fprintf (stderr, "***gc[%d]...", g_free);
+#else
+  if (g_debug)
+    {
+      eputs ("***gc[");
+      eputs (itoa (g_free));
+      eputs ("]...");
+    }
+#endif
   g_free = 1;
   if (g_cells < g_news && ARENA_SIZE < MAX_ARENA_SIZE) gc_up_arena ();
   for (int i=g_free; i<g_symbol_max; i++)
@@ -116,7 +151,16 @@ gc ()
   make_tmps (g_news);
   g_symbols = gc_copy (g_symbols);
   SCM new = gc_copy (g_stack);
-  if (g_debug) fprintf (stderr, "new=%d\n", new, g_stack);
+#if _POSIX_SOURCE
+  if (g_debug) fprintf (stderr, "new=%d\n", new);
+#else
+  if (g_debug)
+    {
+      eputs ("new=");
+      eputs (itoa (new));
+      eputs ("\n");
+    }
+#endif
   g_stack = new;
   return gc_loop (1);
 }
diff --git a/mes.c b/mes.c
index 89a86103..1310c42f 100644
--- a/mes.c
+++ b/mes.c
@@ -209,9 +209,17 @@ SCM r3 = 0; // continuation
 #define VALUE(x) g_cells[x].value
 #define VECTOR(x) g_cells[x].vector
 #define FUNCTION(x) g_functions[g_cells[x].function]
-#define NCAR(x) g_news[x].car
+
 #define NTYPE(x) g_news[x].type
 
+#define NCAR(x) g_news[x].car
+#define NLENGTH(x) g_news[x].length
+
+#define NCDR(x) g_news[x].cdr
+#define NVALUE(x) g_news[x].value
+#define NVECTOR(x) g_news[x].vector
+
+
 #define CAAR(x) CAR (CAR (x))
 #define CADR(x) CAR (CDR (x))
 #define CDAR(x) CDR (CAR (x))
@@ -998,6 +1006,7 @@ mes_builtins (SCM a) ///((internal))
 {
 #include "mes.i"
 
+// Do not sort: Order of these includes define builtins
 #include "posix.i"
 #include "math.i"
 #include "lib.i"
diff --git a/module/language/c99/compiler.mes b/module/language/c99/compiler.mes
index 382058f7..201c7793 100644
--- a/module/language/c99/compiler.mes
+++ b/module/language/c99/compiler.mes
@@ -52,6 +52,7 @@
   (parse-c99
    #:inc-dirs (string-split (getenv "C_INCLUDE_PATH") #\:)
    #:cpp-defs '(
+                "_POSIX_SOURCE=0"
                 "__GNUC__=0"
                 "__MESC__=1"
                 "__NYACC__=1" ;; REMOVEME