Add paths.h stub for systems (such as Solaris 10) without it.

configure.ac

@@ -195,7 +195,7 @@ if test "x$ac_cv_have___va_copy" = "xyes" ; then
 	AC_DEFINE([HAVE___VA_COPY], [1], [Define if __va_copy exists])
 fi
 
-AC_CHECK_HEADERS([sys/sysctl.h err.h md5.h sha2.h])
+AC_CHECK_HEADERS([sys/sysctl.h err.h md5.h paths.h sha2.h])
 AC_CHECK_HEADERS([sys/sensors.h],
 	AM_CONDITIONAL(HAVE_SENSORS, true),
 	AM_CONDITIONAL(HAVE_SENSORS, false)

include/Makefile.am

@@ -12,6 +12,7 @@ noinst_HEADERS += md5.h
 noinst_HEADERS += sha2.h
 noinst_HEADERS += stdlib.h
 noinst_HEADERS += Makefile.in
+noinst_HEADERS += paths.h
 noinst_HEADERS += poll.h
 noinst_HEADERS += time.h
 noinst_HEADERS += tls.h

include/paths.h

@@ -0,0 +1,18 @@
+/*
+ * paths.h compatibility shim
+ */
+
+#ifdef HAVE_PATHS_H
+
+#include_next <paths.h>
+
+#else
+
+#ifndef LIBCOMPAT_PATHS_H
+#define LIBCOMPAT_PATHS_H
+
+#define    _PATH_DEVNULL   "/dev/null"
+
+#endif
+
+#endif