Index: roc-pulse/cmake/setup_pulseaudio.cmake
===================================================================
--- roc-pulse.orig/cmake/setup_pulseaudio.cmake
+++ roc-pulse/cmake/setup_pulseaudio.cmake
@@ -1,4 +1,5 @@
 set(PULSEAUDIO_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/pulsebuild")
+include(ExternalProject)
 
 # This command runs "meson setup" to generate pulse/version.h
 # We don't actually build PulseAudio