diff -pNaru5 a/src/p2c.h b/src/p2c.h
--- a/src/p2c.h	1993-12-08 00:36:54.000000000 -0500
+++ b/src/p2c.h	2022-12-25 23:54:13.122754732 -0500
@@ -309,11 +309,12 @@ extern long     strtol      PP( (Const C
 extern Anyptr   malloc      PP( (size_t) );
 extern Void     free        PP( (Anyptr) );
 #endif
 #endif
 
-extern int      _OutMem     PV();
+#include <stdint.h>
+extern intptr_t _OutMem     PV();
 extern int      _CaseCheck  PV();
 extern int      _NilCheck   PV();
 extern int	_Escape     PP( (int) );
 extern int	_EscIO      PP( (int) );
 extern int	_EscIO2     PP( (int, Char *) );
diff -pNaru5 a/src/p2clib.c b/src/p2clib.c
--- a/src/p2clib.c	1993-12-08 00:36:53.000000000 -0500
+++ b/src/p2clib.c	2022-12-25 23:54:47.053106957 -0500
@@ -959,11 +959,11 @@ register int len, n;
 }
 
 
 
 
-int _OutMem()
+intptr_t _OutMem()
 {
     return _Escape(-2);
 }
 
 int _CaseCheck()