libsn/sn.h error with x11/tint

[tatoolz at yahoo.de]

I use FreeBSD 10.3 on AMD64.
When i will install x11/tint, stop with this error:
[ 21%] Building C object src/tint2conf/CMakeFiles/tint2conf.dir/__/util/common.c.oIn file included from /usr/ports/x11/tint/work/tint2-0.12.7/src/server.c:28:/usr/ports/x11/tint/work/tint2-0.12.7/src/server.h:17:10: fatal error: 'libsn/sn.h' file not found#include <libsn/sn.h>         ^In file included from /usr/ports/x11/tint/work/tint2-0.12.7/src/panel.c:30:/usr/ports/x11/tint/work/tint2-0.12.7/src/server.h:17:10: fatal error: 'libsn/sn.h' file not found#include <libsn/sn.h>         ^1 error generated.--- CMakeFiles/tint2.dir/src/server.c.o ---*** [CMakeFiles/tint2.dir/src/server.c.o] Error code 1
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.71 error generated.In file included from /usr/ports/x11/tint/work/tint2-0.12.7/src/util/common.c:33:/usr/ports/x11/tint/work/tint2-0.12.7/src/util/../server.h:17:10: fatal error: 'libsn/sn.h' file not found#include <libsn/sn.h>         ^--- CMakeFiles/tint2.dir/src/panel.c.o ---*** [CMakeFiles/tint2.dir/src/panel.c.o] Error code 1
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.7In file included from /usr/ports/x11/tint/work/tint2-0.12.7/src/config.c:43:/usr/ports/x11/tint/work/tint2-0.12.7/src/server.h:17:10: fatal error: 'libsn/sn.h' file not found#include <libsn/sn.h>         ^1 error generated.--- CMakeFiles/tint2.dir/src/config.c.o ---*** [CMakeFiles/tint2.dir/src/config.c.o] Error code 1
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.73 errors
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.7--- CMakeFiles/tint2.dir/all ---*** [CMakeFiles/tint2.dir/all] Error code 2
make[3]: stopped in /usr/ports/x11/tint/work/tint2-0.12.71 error generated.--- src/tint2conf/CMakeFiles/tint2conf.dir/__/util/common.c.o ---*** [src/tint2conf/CMakeFiles/tint2conf.dir/__/util/common.c.o] Error code 1
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.71 error
make[4]: stopped in /usr/ports/x11/tint/work/tint2-0.12.7--- src/tint2conf/CMakeFiles/tint2conf.dir/all ---*** [src/tint2conf/CMakeFiles/tint2conf.dir/all] Error code 2
make[3]: stopped in /usr/ports/x11/tint/work/tint2-0.12.72 errors
make[3]: stopped in /usr/ports/x11/tint/work/tint2-0.12.7*** [all] Error code 2
make[2]: stopped in /usr/ports/x11/tint/work/tint2-0.12.71 error
make[2]: stopped in /usr/ports/x11/tint/work/tint2-0.12.7===> Compilation failed unexpectedly.Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure tothe maintainer.*** Error code 1
Stop.make[1]: stopped in /usr/ports/x11/tint*** Error code 1
Stop.make: stopped in /usr/ports/x11/tint
Someone has a tip?