AC_CHECK_HEADERS(sys/termio.h sys/statfs.h sys/dustat.h sys/statvfs.h stdarg.h sys/sockio.h)
AC_CHECK_HEADERS(security/pam_modules.h security/_pam_macros.h ldap.h lber.h dlfcn.h)
AC_CHECK_HEADERS(sys/syslog.h syslog.h)
-AC_CHECK_HEADERS(valgrind.h)
+
+# In valgrind 1.0.x, it's just valgrind.h. In 1.9.x+ there's a
+# subdirectory of headers.
+AC_CHECK_HEADERS(valgrind.h valgrind/valgrind.h valgrind/memcheck.h)
#
# HPUX has a bug in that including shadow.h causes a re-definition of MAXINT.