rtbuf/rtbuf

diff --git a/lib/sndio/Makefile.am b/lib/sndio/Makefile.am
index 97dded0..36f3f73 100644
--- a/lib/sndio/Makefile.am
+++ b/lib/sndio/Makefile.am
@@ -1,3 +1,4 @@
+if ENABLE_SNDIO
 
 CLEANFILES =
 rtbuf_includedir = $(includedir)/rtbuf/sndio
@@ -12,3 +13,5 @@ input_la_LIBADD = ${SNDIO_LIBS} ../librtbuf_signal.la
 rtbuf_lib_LTLIBRARIES += output.la
 output_la_LDFLAGS = -no-undefined -module -shared
 output_la_LIBADD = ${SNDIO_LIBS} ../librtbuf_signal.la
+
+endif