compile error LyX 1.5.1

[Marco Beishuizen]

Hi,

Installing LyX 1.5.1 from ports gives the following error during 
compiling (on 6.2-Stable):

...
filetools.cpp:416: error: `fs::filesystem_error' has not been declared
filetools.cpp:416: error: invalid catch parameter
filetools.cpp:416: error: expected `)' before "const"
filetools.cpp:416: error: expected `{' before "const"
filetools.cpp:416: error: expected initializer before ')' token
gmake[5]: *** [filetools.lo] Error 1
gmake[5]: Leaving directory 
`/usr/ports/print/lyx15/work/lyx-1.5.1/src/support'
gmake[4]: *** [all-recursive] Error 1
gmake[4]: Leaving directory 
`/usr/ports/print/lyx15/work/lyx-1.5.1/src/support'
gmake[3]: *** [all] Error 2
gmake[3]: Leaving directory 
`/usr/ports/print/lyx15/work/lyx-1.5.1/src/support'
gmake[2]: *** [all-recursive] Error 1
gmake[2]: Leaving directory `/usr/ports/print/lyx15/work/lyx-1.5.1/src'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory `/usr/ports/print/lyx15/work/lyx-1.5.1/src'
gmake: *** [all-recursive] Error 1
*** Error code 2
...

Does anyone have a clue what the problem is here?

Thanks in advance,

Marco

-- 
The wages of sin are high but you get your money's worth.