--- configure.ac	(Asterisk 13.20)
+++ configure.ac	(working copy)
@@ -2254,2 +2254,3 @@
 
+AST_PKG_CONFIG_CHECK([PORTAUDIO], [portaudio-2.0])
 AST_EXT_LIB_CHECK([PORTAUDIO], [portaudio], [Pa_GetDeviceCount], [portaudio.h])