+# ------------------------------------------------------------------------------
+have_bzip2=no
+AC_ARG_ENABLE(bzip2, AS_HELP_STRING([--enable-bzip2], [Enable optional BZIP2 support]))
+AS_IF([test "x$enable_bzip2" != "xno"], [
+ AC_CHECK_HEADERS(bzlib.h,
+ [AC_DEFINE(HAVE_BZIP2, 1, [Define in BZIP2 is available]) have_bzip2=yes],
+ [AC_MSG_ERROR([*** BZIP2 support requested but headers not found])])
+])
+AM_CONDITIONAL(HAVE_BZIP2, [test "$have_bzip2" = "yes"])
+