--- a/ports/cmake/src/CMakeLists.txt
+++ b/ports/cmake/src/CMakeLists.txt
@@ -363,7 +363,6 @@
 if(BUILD_LIBOUT123)
     add_subdirectory("libout123")
 endif()
-add_subdirectory("libsyn123")
 
 if(UNIX)
     option(BUILD_PROGRAMS "Build programs" ON)