diff --git a/cmdline/portable.h b/cmdline/portable.h
index 46af03a5..eaadc562 100644
--- a/cmdline/portable.h
+++ b/cmdline/portable.h
@@ -153,6 +153,10 @@
 #include <sys/stat.h>
 #endif
 
+#if HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
 #if HAVE_GETOPT_H
 #include <getopt.h>
 #endif
diff --git a/configure.ac b/configure.ac
index a2af5a16..5fa3b6b8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@ AC_HEADER_TIME
 AC_CHECK_HEADERS([fcntl.h stddef.h stdint.h stdlib.h string.h limits.h])
 AC_CHECK_HEADERS([unistd.h getopt.h fnmatch.h io.h inttypes.h byteswap.h])
 AC_CHECK_HEADERS([pthread.h])
-AC_CHECK_HEADERS([sys/time.h sys/file.h sys/ioctl.h sys/vfs.h sys/statfs.h sys/param.h sys/mount.h])
+AC_CHECK_HEADERS([sys/time.h sys/wait.h sys/file.h sys/ioctl.h sys/vfs.h sys/statfs.h sys/param.h sys/mount.h])
 AC_CHECK_HEADERS([linux/fiemap.h linux/fs.h mach/mach_time.h])
 
 dnl Checks for typedefs, structures, and compiler characteristics.