diff --git a/DeckLink/Driver/DesktopVideo-8.0.1-i386.tar.gz b/DeckLink/Driver/DesktopVideo-8.0.1-i386.tar.gz
index d41a6e8af..9cd78acce 100644
Binary files a/DeckLink/Driver/DesktopVideo-8.0.1-i386.tar.gz and b/DeckLink/Driver/DesktopVideo-8.0.1-i386.tar.gz differ
diff --git a/DeckLink/Driver/DesktopVideo-8.0.1-x86_64.tar.gz b/DeckLink/Driver/DesktopVideo-8.0.1-x86_64.tar.gz
index 614dae56c..51fd279b9 100644
Binary files a/DeckLink/Driver/DesktopVideo-8.0.1-x86_64.tar.gz and b/DeckLink/Driver/DesktopVideo-8.0.1-x86_64.tar.gz differ
diff --git a/ultragrid/Makefile.in b/ultragrid/Makefile.in
index 317542539..87cf71a8c 100644
--- a/ultragrid/Makefile.in
+++ b/ultragrid/Makefile.in
@@ -4,7 +4,7 @@ CC            = @CC@
 CXX	      = @CXX@
 LINKER	      = @LINKER@
 CFLAGS        = @DEFS@ @CFLAGS@ @X_CFLAGS@
-LIBS          = @DVS_LIB@ @DXT_LIB@ @QUICKTIME_LIB@ @PORTAUDIO_LIB@ @SAGE_LIB@ @X_PRE_LIBS@ @X_LIBS@ @X_EXTRA_LIBS@ @MATHLIBS@ @LIBS@ -lm
+LIBS          = @DVS_LIB@ @DXT_LIB@ @QUICKTIME_LIB@ @PORTAUDIO_LIB@ @SAGE_LIB@ @X_PRE_LIBS@ @X_LIBS@ @X_EXTRA_LIBS@ @MATHLIBS@ @LIBS@ -lm -lrt -pthread
 INC           = -I.. -Isrc -Itest @DVS_INC@ @DXT_INC@ @QUICKTIME_INC@ @DECKLINK_INC@ @PORTAUDIO_INC@ @GL_INC@ @SAGE_INC@ @QUAD_INC@
 DECKLINK_PATH = @DECKLINK_PATH@
 TARGET        = bin/uv
diff --git a/ultragrid/src/audio/portaudio.c b/ultragrid/src/audio/portaudio.c
index 02e80ac1b..5f275c325 100644
--- a/ultragrid/src/audio/portaudio.c
+++ b/ultragrid/src/audio/portaudio.c
@@ -67,6 +67,10 @@ struct state_portaudio_playback {
         PaStream *stream;
 };
 
+/*
+ * For Portaudio threads-related issues see
+ * http://www.portaudio.com/trac/wiki/tips/Threading
+ */
 static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 
 /* prototyping */