### Add extra directories to check for include files.
LYX_WITH_DIR([extra-inc],[extra include directory],extra_inc, NONE)
LYX_LOOP_DIR($lyx_cv_extra_inc,LYX_ADD_INC_DIR(lyx_cppflags,$dir))
### Add extra directories to check for include files.
LYX_WITH_DIR([extra-inc],[extra include directory],extra_inc, NONE)
LYX_LOOP_DIR($lyx_cv_extra_inc,LYX_ADD_INC_DIR(lyx_cppflags,$dir))