diff --git a/SConstruct b/SConstruct
index 49b88d6..efb592b 100644
--- a/SConstruct
+++ b/SConstruct
@@ -100,6 +100,8 @@ if conf.CheckCHeader('sys/resource.h'):
     conf.env.Append(CPPFLAGS = '-DHAVE_SYS_RESOURCE_H')
 if conf.CheckCHeader('sys/syslimits.h'):
     conf.env.Append(CPPFLAGS = '-DHAVE_SYS_SYSLIMITS_H')
+if conf.CheckCHeader('sys/wait.h'):
+    conf.env.Append(CPPFLAGS = '-DHAVE_SYS_WAIT_H')
 env.Append(CPPFLAGS = '-DSIZEOF_CHAR='+conf.sizeOf("char"))
 env.Append(CPPFLAGS = '-DSIZEOF_LONG='+conf.sizeOf("long"))
 env.Append(CPPFLAGS = '-DSIZEOF_SHORT='+conf.sizeOf("short"))