diff --git a/ChangeLog b/ChangeLog
index 6108cd01..f34a7989 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+1998-07-17  Martin Baulig  <baulig@Stud.Informatik.uni-trier.de>
+
+	* sysdeps/linux/sem_limits.c: Applied patch from Albert K T Hui
+	<avatar@deva.net> for glibc 2.1.
+
 1998-07-15  Martin Baulig  <martin@home-of-linux.org>
 
 	* sysdeps/sun4/loadavg.h: New file. Imported from top 3.4.
diff --git a/sysdeps/linux/sem_limits.c b/sysdeps/linux/sem_limits.c
index 88176f0b..19203a33 100644
--- a/sysdeps/linux/sem_limits.c
+++ b/sysdeps/linux/sem_limits.c
@@ -24,6 +24,16 @@
 #include <sys/ipc.h>
 #include <sys/sem.h>
 
+#ifdef _SEM_SEMUN_UNDEFINED
+union semun
+{
+	int val;
+	struct semid_ds *buf;
+	unsigned short int *array;
+	struct seminfo *__buf;
+};
+#endif
+
 static unsigned long _glibtop_sysdeps_sem_limits =
 (1 << GLIBTOP_IPC_SEMMAP) + (1 << GLIBTOP_IPC_SEMMNI) +
 (1 << GLIBTOP_IPC_SEMMNS) + (1 << GLIBTOP_IPC_SEMMNU) +