AC_CHECK_MEMBER([struct stat.st_blksize],[
AC_DEFINE([HAVE_STRUCT_STAT_ST_BLKSIZE],[1],[Define to 1 if 'st_blksize' is a member of 'struct stat'])])
+dnl Check for gperf.
+AC_CHECK_PROG([GPERF],[gperf],[gperf],[no])
+test "x$GPERF" = "xno" &&
+ AC_MSG_ERROR([gperf must be installed])
+
dnl Check for Augeas (now optional).
AC_CHECK_LIB([augeas],[aug_match],[
LIBS="-laugeas $LIBS"