commit 5a0b123bfd7a843b18318ec2e95ce725c5f1f386
Author: Raphael Kubo da Costa <rakuco@FreeBSD.org>
Date:   Mon Mar 28 15:07:22 2016 +0200

    utils: Include sys/wait.h for the WIFEXITED and WEXITSTATUS macros.

    These two macros are defined in sys/wait.h, which was being included
    indirectly by other headers. This did not work on systems such as
    FreeBSD, so explicitly include all headers that we actually need.

--- src/util/Utils.cpp.orig	2015-11-25 18:45:33 UTC
+++ src/util/Utils.cpp
@@ -43,6 +43,7 @@
 #ifndef _WIN32
 #include <cxxabi.h>
 #include <sys/ioctl.h>
+#include <sys/wait.h>  // WIFEXITED, WEXITSTATUS
 #endif
 
 #ifdef PDAL_COMPILER_MSVC