diff --git a/src/callback/CMakeLists.txt b/src/callback/CMakeLists.txt
index 58dc3de5..114a89e2 100644
--- a/src/callback/CMakeLists.txt
+++ b/src/callback/CMakeLists.txt
@@ -1,14 +1,14 @@
 # callback/CMakeLists.txt
 
 set(SELF_LIB callback)
-set(SELF_SRCS CallbackSet.cpp)
+#set(SELF_SRCS CallbackSet.cpp)
 
-# reminder: can't be header-only library,  because depends on non-header-only refcnt
-xo_add_shared_library(${SELF_LIB} ${PROJECT_VERSION} 1 ${SELF_SRCS})
+xo_add_headeronly_library(${SELF_LIB})
+xo_install_library3(${SELF_LIB} ${PROJECT_NAME}Targets)
 
 # ----------------------------------------------------------------
 # external dependencies:
 
-xo_dependency(${SELF_LIB} refcnt)
+#xo_dependency(${SELF_LIB} refcnt)
 
 # end CMakeLists.txt