--- CMakeLists.txt.orig	2017-11-21 17:47:16 UTC
+++ CMakeLists.txt
@@ -206,6 +206,11 @@ ENDIF()
 FIND_HELPER(LIBARCHIVE libarchive archive.h archive)
 IF( WANT_LIBARCHIVE AND LIBARCHIVE_FOUND)
     SET(WANT_LIBTAR FALSE)
+    SET(LIBTAR_LIBRARIES "")
+    SET(LIBTAR_INCLUDE_DIRS "")
+ELSE()
+    SET(LIBARCHIVE_LIBRARIES "")
+    SET(LIBARCHIVE_INCLUDE_DIRS "")
 ENDIF()
 FIND_HELPER(LIBSNDFILE sndfile sndfile.h sndfile)
 FIND_HELPER(ALSA alsa alsa/asoundlib.h asound )
@@ -215,6 +220,8 @@ FIND_HELPER(OSC liblo lo/lo.h lo)
 
 IF("${CMAKE_SYSTEM_NAME}" MATCHES "NetBSD")
 	FIND_HELPER(OSS oss sys/soundcard.h ossaudio )
+ELSEIF("${CMAKE_SYSTEM_NAME}" MATCHES "FreeBSD")
+	FIND_HELPER(OSS oss sys/soundcard.h c )
 ELSE()
 	FIND_HELPER(OSS oss sys/soundcard.h OSSlib )
 ENDIF()