I tried to compile xffm/xffm-gui package and I got small error message that xffm.h includes secondary.h file but it can't be found.
I looked into SVN history and
it seems it has been deleted from the repo in r20465:


Current Directory: /xffm/
Rev: 20465 - Go to most recent revision
Author:	edscott
Last modification: Rev 20465 - 2006-03-17 12:51:37 +0000 (Fri, 17 Mar 2006)
Log message: doc tweaks

Deleted files:	xffm/trunk/libxffm/libs/secondary.c
xffm/trunk/libxffm/libs/secondary.h


So, I commented out the line including secondary.h and xffm-gui builds without any problems:

mloskot@dog:~/dev/xfce/_svn/xffm/xffm-gui$ cat /usr/local/include/xffm/xffm.h
#include "types.h"
#include "constants.h"
#include "primary.h"
// XXX - mloskot - SVN history says this file was deleted form xffm
//#include "secondary.h"
#include "actions_lib.h"