Not all systems have sys/ipc.h so let's check and only include it if we

have it.

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>

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)