diff --git a/configure.in b/configure.in
index 05b0ebbfe84..73dc78888ff 100644
--- a/configure.in
+++ b/configure.in
@@ -354,6 +354,7 @@ unistd.h \
 unix.h \
 utime.h \
 sys/utsname.h \
+sys/ipc.h \
 ],[],[],[
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
diff --git a/ext/standard/ftok.c b/ext/standard/ftok.c
index adb374e060f..3a0d974c161 100644
--- a/ext/standard/ftok.c
+++ b/ext/standard/ftok.c
@@ -21,7 +21,10 @@
 #include "php.h"
 
 #include <sys/types.h>                                                                                                        
+
+#ifdef HAVE_SYS_IPC_H
 #include <sys/ipc.h>
+#endif
 
 #if HAVE_FTOK
 /* {{{ proto int ftok(string pathname, string proj)