m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
AC_CONFIG_SRCDIR([vbig.cc])
AM_CONFIG_HEADER([config.h])
+AC_CANONICAL_HOST
+case "$host" in
+*-*-darwin* )
+ AC_DEFINE([PURGE_COMMAND],["purge"], [Command to purge filesystem cache])
+ ;;
+*-*-linux* )
+ AC_DEFINE([DROP_CACHE_FILE],["/proc/sys/vm/drop_caches"],
+ [Path to filesystem cache purge interface])
+ ;;
+esac
AC_LANG([C++])
AC_PROG_CXX
AC_PROG_RANLIB