I have my $HOME on a nfs-mount with the following mount-options: rsize=1024,wsize=1024,retry=5,nfsvers=2,soft,intr,udp 0 0 Mutt 1.3.28 from a "emerge mutt" under gentoo-linux-1.1a cannot fcntl() the ~/Mail directory on that mount. I found out that a different configure line solves the problem: ./configure --prefix=/usr --sysconfdir=/etc/mutt --mandir=/usr/share/man --with-docdir=/usr/share/doc/mutt-1.3.28 --with-regex --enable-nfs-fix --enable-pop --enable-external-dotlock --enable-flock --disable-fcntl --enable-imap --with-homespool=Maildir (now mutt flock()'s it instead, works fine as long as sandbox is not loaded, but that is already discussed in 501)
My mail folder is in mbox format
mutt-3.2.28-r1.ebuild