As pointed out by Thomas.
COMMAND native-xml2sdb -i ${CMAKE_CURRENT_SOURCE_DIR}/testdb.xml -o ${CMAKE_CURRENT_BINARY_DIR}/testdb.sdb
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/testdb.xml native-xml2sdb)
-add_custom_target(testdb DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/testdb.sdb)
-add_rc_deps(testdata.rc testdb)
+add_rc_deps(testdata.rc ${CMAKE_CURRENT_BINARY_DIR}/testdb.sdb)
add_executable(apphelp_apitest ${SOURCE})
set_module_type(apphelp_apitest win32cui)
target_link_libraries(apphelp_apitest ${PSEH_LIB})