--- stack/stack.c	2002/03/12 14:53:19	1.105
+++ stack/stack.c	2002/03/12 21:05:11	1.107
@@ -37,12 +37,15 @@
 #include <unistd.h>
 /* EX_NOINPUT, EX_USAGE */
 #include <sysexits.h>
+
+#ifdef __linux__
 /* mtrace, muntrace */
 #include <mcheck.h>
 /* ioctl */
 #include <sys/ioctl.h>
 /* KDMKTONE */
 #include <linux/kd.h>
+#endif /* __linux__ */
 
 #include "stack.h"
 
@@ -883,7 +886,9 @@
   if(env->free_string!=NULL)
     free(env->free_string);
   
+#ifdef __linux__
   muntrace();
+#endif
 
   exit(EXIT_SUCCESS);
 }
@@ -958,7 +963,9 @@
 
   int c;			/* getopt option character */
 
+#ifdef __linux__
   mtrace();
+#endif
 
   init_env(&myenv);
 
@@ -989,7 +996,7 @@
   }
 
   if(myenv.interactive) {
-    printf("Stack version $Revision: 1.105 $\n\
+    printf("Stack version $Revision: 1.107 $\n\
 Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
 Stack comes with ABSOLUTELY NO WARRANTY; for details type `warranty;'.\n\
 This is free software, and you are welcome to redistribute it\n\
@@ -1362,6 +1369,26 @@
   eval(env);
 }
 
+extern void sx_656c7365(environment *env)
+{
+  if(env->head==NULL || CDR(env->head)==NULL 
+     || CDR(CDR(env->head))==NULL || CDR(CDR(CDR(env->head)))==NULL) {
+    printerr("Too Few Arguments");
+    env->err= 1;
+    return;
+  }
+
+  if(CAR(CDR(env->head))->type!=symb
+     || strcmp(CAR(CDR(env->head))->content.sym->id, "if")!=0) {
+    printerr("Bad Argument Type");
+    env->err= 2;
+    return;
+  }
+
+  swap(env); toss(env);
+  ifelse(env);
+}
+
 /* "while" */
 extern void sx_7768696c65(environment *env)
 {
@@ -1652,6 +1679,7 @@
     return sx_72656164(env);
 }
 
+#ifdef __linux__
 extern void beep(environment *env)
 {
   int freq, dur, period, ticks;
@@ -1694,6 +1722,7 @@
     abort();
   }
 }
+#endif /* __linux__ */
 
 /* "wait" */
 extern void sx_77616974(environment *env)