diff --git a/i.c b/i.c
index 8b8b40a..428a116 100644
--- a/i.c
+++ b/i.c
@@ -3874,9 +3874,10 @@ define_instruction(fren) {
 }
 
 define_instruction(argvref) {
+  extern char *argv_ref(int idx);
   int i; char *s; ckk(ac);
   i = get_fixnum(ac); /* todo: range-check */
-  s = cxg_argv[i];
+  s = argv_ref(i);
   if (s) ac = string_obj(newstring(s));
   else ac = bool_obj(0); 
   gonexti(); 
@@ -3891,10 +3892,10 @@ define_instruction(getenv) {
 }
 
 define_instruction(envvref) {
-  extern const char *environ_ref(int idx);
+  extern char *envv_ref(int idx);
   int i; char *s; ckk(ac);
   i = get_fixnum(ac); /* todo: range-check */
-  s = (char *)environ_ref(i);
+  s = envv_ref(i);
   if (s) ac = string_obj(newstring(s));
   else ac = bool_obj(0); 
   gonexti(); 
diff --git a/s.c b/s.c
index be91040..f9f5f9d 100644
--- a/s.c
+++ b/s.c
@@ -17,21 +17,30 @@ int dirsep = '\\';
 int dirsep = '/';
 #endif
 
-#if defined(WIN32)
-#define sxc_environ _environ
-#elif defined(__linux) || defined(__APPLE__)
-#define sxc_environ environ
-#else /* add more systems? */
-char **sxc_environ = { NULL };
-#endif
-
-extern const char *environ_ref(int idx)
+extern char *argv_ref(int idx)
 {
-  const char **pe = sxc_environ;
+  char **pv = cxg_argv;
   /* be careful with indexing! */
   if (idx < 0) return NULL;
-  while (idx-- > 0) if (*pe++ == NULL) return NULL;
-  return *pe;
+  while (idx-- > 0) if (*pv++ == NULL) return NULL;
+  return *pv;
+}
+
+#if defined(WIN32)
+#define cxg_envv _environ
+#elif defined(__linux) || defined(__APPLE__)
+#define cxg_envv environ
+#else /* add more systems? */
+char **cxg_envv = { NULL };
+#endif
+
+extern char *envv_ref(int idx)
+{
+  char **pv = cxg_envv;
+  /* be careful with indexing! */
+  if (idx < 0) return NULL;
+  while (idx-- > 0) if (*pv++ == NULL) return NULL;
+  return *pv;
 }
 
 char *s_code[] = {
@@ -1040,6 +1049,11 @@ char *s_code[] = {
   "P", "feature-available?",
   "%1.0Y0?{${@(y8:features)[00},.1A0]1}f]1",
 
+  "C", 0,
+  "f,#0.0,&1{%0:0^,.0?{.0]1}'0,n,,#0.0,:0,&2{%2.1Z2,.0?{.0,'(c=)S8,.0?{.0"
+  ",'0,.3S7}{.1},.1?{.2S3,'1,.3I+,.4S7}{'(s0:)},'1,.6I+,.5,.2,.4cc,:1^[62"
+  "}.1A9:!0:0^]3}.!0.0^_1[12}_1@!(y25:get-environment-variables)",
+
   "P", "emergency-exit",
   "%!0.0u?{tZ9]1}.0aZ9]1",
 
diff --git a/src/s.scm b/src/s.scm
index d99f50d..b002138 100644
--- a/src/s.scm
+++ b/src/s.scm
@@ -1955,9 +1955,18 @@
 
 (define (feature-available? f) (and (symbol? f) (memq f (features))))
 
-;TBD:
-;
-;get-environment-variables
+(define get-environment-variables
+  (let ([evl #f])
+    (lambda ()
+      (or evl
+        (let loop ([r '()] [i 0])
+          (let ([kvs (%envv-ref i)])
+            (if kvs
+                (let* ([p (string-position #\= kvs)] ; should be there?
+                       [key (if p (substring kvs 0 p) kvs)]
+                       [val (if p (substring kvs (fx+ p 1) (string-length kvs)) "")])
+                  (loop (cons (cons key val) r) (fx+ i 1)))
+                (begin (set! evl (reverse! r)) evl))))))))
 
 (define (emergency-exit . ?obj)
   (if (null? ?obj) (%exit) (%exit (car ?obj))))