+AC_ARG_ENABLE([webrtc-aec],
+ AS_HELP_STRING([--enable-webrtc-aec], [Enable the optional WebRTC-based echo canceller]))
+
+AS_IF([test "x$enable_webrtc_aec" != "xno"],
+ [PKG_CHECK_MODULES(WEBRTC, [ webrtc-audio-processing ], [HAVE_WEBRTC=1], [HAVE_WEBRTC=0])],
+ [HAVE_WEBRTC=0])
+
+AS_IF([test "x$enable_webrtc_aec" = "xyes" && test "x$HAVE_WEBRTC" = "x0"],
+ [AC_MSG_ERROR([*** webrtc-audio-processing library not found])])
+
+AC_SUBST(WEBRTC_CFLAGS)
+AC_SUBST(WEBRTC_LIBS)
+AM_CONDITIONAL([HAVE_WEBRTC], [test "x$HAVE_WEBRTC" = "x1"])
+