+SR_ARG_OPT_PKG([zlib], [ZLIB], , [zlib])
+AM_CONDITIONAL([HAVE_ZLIB], [test "x$sr_have_zlib" = xyes])
+AM_COND_IF([HAVE_ZLIB], [
+ SR_APPEND([sr_deps_avail], [crc32 zlib])
+ SR_PREPEND([SR_EXTRA_LIBS], [-lz])
+])
+
+AM_CONDITIONAL([HAVE_INPUT_STF], [test "x$sr_have_zlib" = xyes])
+AM_COND_IF([HAVE_INPUT_STF], [
+ AC_DEFINE([HAVE_INPUT_STF], [1], [Is the STF input module supported?])
+])
+