--- Xos_r.h.in.orig	2006-12-09 08:08:04.000000000 -0600
+++ Xos_r.h.in	2006-12-09 08:08:04.000000000 -0600
@@ -188,6 +188,13 @@
 #  endif
 # endif
 
+#undef _XOS_R_H_MTSAFE_DIRENTAPI
+#undef _XOS_R_H_MTSAFE_NETDBAPI
+#undef _XOS_R_H_MTSAFE_PWDAPI
+#undef _XOS_R_H_MTSAFE_UNISTDAPI
+#undef _XOS_R_H_MTSAFE_STRINGAPI
+#undef _XOS_R_H_MTSAFE_TIMEAPI
+#undef _XOS_R_H_MTSAFE_GRPAPI
 #endif /* !defined WIN32 */
 
 /*
@@ -226,7 +233,7 @@
 
 #if defined(X_INCLUDE_PWD_H) && !defined(_XOS_INCLUDED_PWD_H)
 # include <pwd.h>
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_PWDAPI)
+# if defined(_XOS_MTSAFE_PWAPI)
 #  define XOS_USE_MTSAFE_PWDAPI 1
 # endif
 #endif
@@ -410,7 +417,7 @@
 #if defined(X_INCLUDE_NETDB_H) && !defined(_XOS_INCLUDED_NETDB_H) \
     && !defined(WIN32)
 # include <netdb.h>
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_NETDBAPI)
+# if defined(_XOS_R_H_MTSAFE_NETDBAPI)
 #  define XOS_USE_MTSAFE_NETDBAPI 1
 # endif
 #endif
@@ -573,7 +580,7 @@
 #   define dirent direct
 #  endif
 # endif
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_DIRENTAPI)
+# if defined(_XOS_R_H_MTSAFE_DIRENTAPI)
 #  define XOS_USE_MTSAFE_DIRENTAPI 1
 # endif
 #endif
@@ -691,7 +698,7 @@
 
 #if defined(X_INCLUDE_UNISTD_H) && !defined(_XOS_INCLUDED_UNISTD_H)
 /* <unistd.h> already included by <X11/Xos.h> */
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_UNISTDAPI)
+# if defined(_XOS_R_H__MTSAFE_UNISTDAPI)
 #  define XOS_USE_MTSAFE_UNISTDAPI 1
 # endif
 #endif
@@ -831,7 +838,7 @@
 
 #if defined(X_INCLUDE_STRING_H) && !defined(_XOS_INCLUDED_STRING_H)
 /* <string.h> has already been included by <X11/Xos.h> */
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_STRINGAPI)
+# if defined(_XOS_R_H_MTSAFE_STRINGAPI)
 #  define XOS_USE_MTSAFE_STRINGAPI 1
 # endif
 #endif
@@ -883,7 +890,7 @@
 
 #if defined(X_INCLUDE_TIME_H) && !defined(_XOS_INCLUDED_TIME_H)
 # include <time.h>
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_TIMEAPI)
+# if defined(_XOS_R_H_MTSAFE_TIMEAPI)
 #  define XOS_USE_MTSAFE_TIMEAPI 1
 # endif
 #endif
@@ -1046,7 +1053,7 @@
 
 #if defined(X_INCLUDE_GRP_H) && !defined(_XOS_INCLUDED_GRP_H)
 # include <grp.h>
-# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_GRPAPI)
+# if defined(_XOS_R_H_MTSAFE_GRPAPI)
 #  define XOS_USE_MTSAFE_GRPAPI 1
 # endif
 #endif