diff --git a/include/cyclone/runtime.h b/include/cyclone/runtime.h
index b2e52ec9..9141b406 100644
--- a/include/cyclone/runtime.h
+++ b/include/cyclone/runtime.h
@@ -92,8 +92,6 @@ object apply(object cont, object func, object args);
 void Cyc_apply(int argc, closure cont, object prim, ...);
 integer_type Cyc_string_cmp(object str1, object str2);
 void dispatch_string_91append(int argc, object clo, object cont, object str1, ...);
-string_type Cyc_string_append(int argc, object str1, ...);
-string_type Cyc_string_append_va_list(int, object, va_list);
 list mcons(object,object);
 cvar_type *mcvar(object *var);
 object Cyc_display(object, FILE *port);
@@ -134,7 +132,7 @@ integer_type Cyc_string_length(object str);
 object Cyc_substring(object cont, object str, object start, object end);
 object Cyc_string_ref(object str, object k);
 object Cyc_string_set(object str, object k, object chr);
-string_type Cyc_installation_dir();
+object Cyc_installation_dir(object cont, object type);
 object Cyc_command_line_arguments(object cont);
 integer_type Cyc_system(object cmd);
 integer_type Cyc_char2integer(object chr);
diff --git a/runtime.c b/runtime.c
index 5b5ddb0d..fb4cb665 100644
--- a/runtime.c
+++ b/runtime.c
@@ -1054,7 +1054,7 @@ object Cyc_substring(object cont, object str, object start, object end) {
 
   {
     make_string_with_len(sub, raw + s, e - s);
-    return_closcall1(cont, sub);
+    return_closcall1(cont, &sub);
   }
 }
 
@@ -1062,28 +1062,28 @@ object Cyc_substring(object cont, object str, object start, object end) {
  * Return directory where cyclone is installed.
  * This is configured via the makefile during a build.
  */
-string_type Cyc_installation_dir(object type) {
+object Cyc_installation_dir(object cont, object type) {
   if (Cyc_is_symbol(type) == boolean_t &&
       strncmp(((symbol)type)->pname, "sld", 5) == 0) {
     char buf[1024];
     snprintf(buf, sizeof(buf), "%s", CYC_INSTALL_SLD);
     make_string(str, buf);
-    return str;
+    return_closcall1(cont, &str);
   } else if (Cyc_is_symbol(type) == boolean_t &&
       strncmp(((symbol)type)->pname, "lib", 5) == 0) {
     char buf[1024];
     snprintf(buf, sizeof(buf), "%s", CYC_INSTALL_LIB);
     make_string(str, buf);
-    return str;
+    return_closcall1(cont, &str);
   } else if (Cyc_is_symbol(type) == boolean_t &&
       strncmp(((symbol)type)->pname, "inc", 5) == 0) {
     char buf[1024];
     snprintf(buf, sizeof(buf), "%s", CYC_INSTALL_INC);
     make_string(str, buf);
-    return str;
+    return_closcall1(cont, &str);
   } else {
     make_string(str, CYC_INSTALL_DIR);
-    return str;
+    return_closcall1(cont, &str);
   }
 }
 
@@ -1727,8 +1727,7 @@ void _cyc_string_91ref(object cont, object args) {
       return_closcall1(cont, c); }}
 void _Cyc_91installation_91dir(object cont, object args) {
     Cyc_check_num_args("Cyc-installation-dir", 1, args);
-    { string_type dir = Cyc_installation_dir(car(args));
-      return_closcall1(cont, &dir);}}
+    Cyc_installation_dir(cont, car(args));}
 void _command_91line_91arguments(object cont, object args) {
     object cmdline = Cyc_command_line_arguments(cont);
     return_closcall1(cont, cmdline); }
diff --git a/scheme/cyclone/cgen.sld b/scheme/cyclone/cgen.sld
index f0f1d899..7d5075d7 100644
--- a/scheme/cyclone/cgen.sld
+++ b/scheme/cyclone/cgen.sld
@@ -590,6 +590,7 @@
     ((eq? p 'make-vector) "object")
     ((eq? p 'list->string) "object")
     ((eq? p 'list->vector) "object")
+    ((eq? p 'Cyc-installation-dir) "object")
     (else #f)))
 
 ;; Determine if primitive creates a C variable
@@ -619,14 +620,14 @@
   (and (prim? exp)
        (member exp '(Cyc-read-line apply command-line-arguments number->string 
                      symbol->string list->string substring
-                     make-vector list->vector))))
+                     make-vector list->vector Cyc-installation-dir))))
 ;; TODO: this is a hack, right answer is to include information about
 ;;  how many args each primitive is supposed to take
 (define (prim:cont-has-args? exp)
   (and (prim? exp)
        (member exp '(Cyc-read-line apply number->string symbol->string 
                      list->string substring
-                     make-vector list->vector))))
+                     make-vector list->vector Cyc-installation-dir))))
 
 ;; Pass an integer arg count as the function's first parameter?
 (define (prim:arg-count? exp)