diff --git a/getcwd.c b/getcwd.c
index c329f958b..3b36c82cf 100644
--- a/getcwd.c
+++ b/getcwd.c
@@ -66,6 +66,12 @@ extern int lstat();
 #endif /* _PATH_PWD */
 
 
+/*
+ * Since we can't count on this being defined...
+ */
+extern int errno;
+
+
 /******************************************************************
  *
  *  getcwd()
diff --git a/getwd.c b/getwd.c
index c329f958b..3b36c82cf 100644
--- a/getwd.c
+++ b/getwd.c
@@ -66,6 +66,12 @@ extern int lstat();
 #endif /* _PATH_PWD */
 
 
+/*
+ * Since we can't count on this being defined...
+ */
+extern int errno;
+
+
 /******************************************************************
  *
  *  getcwd()
diff --git a/realpath.c b/realpath.c
index 172c786fc..42acf242d 100644
--- a/realpath.c
+++ b/realpath.c
@@ -69,12 +69,18 @@ extern int lstat();
  * Prototypes
  */
 #ifdef HAVE_FCHDIR
-static char * realpath_ret(char *, FILE *);
+static char * realpath_ret	__P((char *, FILE *));
 #else
-static char * realpath_ret(char *, char *);
+static char * realpath_ret	__P((char *, char *));
 #endif /* HAVE_FCHDIR */
 
 
+/*
+ * Since we can't count on this being defined...
+ */
+extern int errno;
+
+
 /******************************************************************
  *
  *  realpath()
diff --git a/sudo_realpath.c b/sudo_realpath.c
index 172c786fc..42acf242d 100644
--- a/sudo_realpath.c
+++ b/sudo_realpath.c
@@ -69,12 +69,18 @@ extern int lstat();
  * Prototypes
  */
 #ifdef HAVE_FCHDIR
-static char * realpath_ret(char *, FILE *);
+static char * realpath_ret	__P((char *, FILE *));
 #else
-static char * realpath_ret(char *, char *);
+static char * realpath_ret	__P((char *, char *));
 #endif /* HAVE_FCHDIR */
 
 
+/*
+ * Since we can't count on this being defined...
+ */
+extern int errno;
+
+
 /******************************************************************
  *
  *  realpath()