Index: src/Makefile.am
===================================================================
--- src/Makefile.am.orig
+++ src/Makefile.am
@@ -54,7 +54,7 @@ aegisub_2_1_LDADD += libaudio_player.a
 if HAVE_ALSA
 noinst_LIBRARIES += libaudio_alsa.a
 libaudio_alsa_a_SOURCES = audio_player_alsa.cpp
-aegisub_2_1_LDADD += libaudio_alsa.a @ALSA_LIBS@
+aegisub_2_1_LDADD += libaudio_alsa.a @ALSA_LIBS@ -lrt
 endif
 
 if HAVE_PORTAUDIO
Index: src/Makefile.in
===================================================================
--- src/Makefile.in.orig
+++ src/Makefile.in
@@ -40,7 +40,7 @@ host_triplet = @host@
 bin_PROGRAMS = aegisub-2.1$(EXEEXT)
 @BUILD_DARWIN_TRUE@am__append_3 = -L/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries
 @HAVE_ALSA_TRUE@am__append_4 = libaudio_alsa.a
-@HAVE_ALSA_TRUE@am__append_5 = libaudio_alsa.a @ALSA_LIBS@
+@HAVE_ALSA_TRUE@am__append_5 = libaudio_alsa.a @ALSA_LIBS@ -lrt
 @HAVE_PORTAUDIO_TRUE@am__append_6 = libaudio_portaudio.a
 @HAVE_PORTAUDIO_TRUE@am__append_7 = libaudio_portaudio.a @PORTAUDIO_LIBS@
 @HAVE_PULSEAUDIO_TRUE@am__append_8 = libaudio_pulseaudio.a