0.9.5 debug-install warning on Solaris

[David I.]

> uname -a

SunOS fwcatdev 5.8 Generic_117350-49 sun4u sparc SUNW,Sun-Fire-V240

>hg debuginstall
Checking encoding (646)...
Checking extensions...
Checking templates...
Checking patch...
Checking merge helper...
diff: illegal option -- u
usage: diff [-bitw] [-c | -e | -f | -h | -n] file1 file2
       diff [-bitw] [-C number] file1 file2
       diff [-bitw] [-D string] file1 file2
       diff [-bitw] [-c | -e | -f | -h | -n] [-l] [-r] [-s] [-S name]
directory1 directory2
 Got unexpected merge results!
 (your merge helper may have the wrong argument order)
 Result: '1\n2\n3\ninsert\n4\n'
Checking commit editor...
Checking username...
 No username found, using 'imat at fwcatdev' instead
 (specify a username in your .hgrc file)
1 problems detected, please check your install!

How should I fix this?

David 
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