https://github.com/MaartenBaert/ssr/issues/599
https://bugs.gentoo.org/641680#c10

--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,9 +3,11 @@
 find_package(Threads REQUIRED)
 find_package(ALSA REQUIRED)
 find_package(FFmpeg REQUIRED)
-find_package(PulseAudio REQUIRED)
 find_package(X11 REQUIRED)
 
+if(WITH_PULSEAUDIO)
+	find_package(PulseAudio REQUIRED)
+endif()
 if(WITH_JACK)
 	find_package(Jack REQUIRED)
 endif()