$NetBSD$

Detect pkgsrc portaudio using pkg-config.

--- cmake-proxies/CMakeLists.txt.orig	2020-06-19 15:16:47.000000000 +0000
+++ cmake-proxies/CMakeLists.txt
@@ -132,7 +132,7 @@ addlib( expat              expat       E
 addlib( lame               lame        LAME        YES   YES   "lame >= 3.100" )
 addlib( libsndfile         sndfile     SNDFILE     YES   YES   "sndfile >= 1.0.28" )
 addlib( libsoxr            soxr        SOXR        YES   YES   "soxr >= 0.1.1" )
-addlib( portaudio-v19      portaudio   PORTAUDIO   YES   YES   "" )
+addlib( portaudio-v19      portaudio   PORTAUDIO   YES   YES   "portaudio-2.0 >= 19" )
 
 # Optional libraries
 #
