ecore_con uses eina_prefix and a file that is used by eina_prefix doesn't exist.
this patch adds the file
You refer to the call in src/lib/ecore_con/ecore_con_proxy_helper.c ?
426 _efl_net_proxy_helper_prefix = eina_prefix_new
427 (NULL, ecore_con_init, "ECORE", "ecore", "checkme",
428 PACKAGE_BIN_DIR, PACKAGE_LIB_DIR, PACKAGE_DATA_DIR, PACKAGE_DATA_DIR);
This is using ecore and not ecore_con. If we want to use ecore_con for this we need to chance this as well.
When looking into this I also found that we create a ecore_x checkme file but are not using it in our code.