NA Filesys-DiskFree-0.06 i386-openbsd 2.9

This distribution has been tested as part of the cpan-testers
effort to test as many new uploads to CPAN as possible.  See
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Please cc any replies to cpan-testers@perl.org to keep other
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-- 
Test success but ...
bash-2.05$ perl eg/perldf
No df command known for format openbsd at eg/perldf line 18

May be you can add this in your test ?
If you want output df for openbsd:

big-bang:~$ df
Filesystem  512-blocks     Used    Avail Capacity  Mounted on
/dev/wd1a      1839548   769366   978206    44%    /
big-bang:~$ df -i
Filesystem  512-blocks     Used    Avail Capacity iused   ifree  %iused  Mounted on
/dev/wd1a      1839548   769366   978206    44%   22349  204209    10%   /
big-bang:~$ df -ik
Filesystem  1K-blocks     Used    Avail Capacity iused   ifree  %iused  Mounted on
/dev/wd1a      919774   384683   489103    44%   22349  204209    10%   /

--

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=openbsd, osvers=2.9, archname=i386-openbsd
    uname='openbsd'
    config_args='-Dopenbsd_distribution=defined -dsE'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=2.95.3 20010125 (prerelease)
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccflags ='-fno-strict-aliasing -I/usr/local/include'
    stdchar='char', d_stdstdio=undef, usevfork=true
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =''
    libpth=/usr/lib
    libs=-lm -lc
    libc=/usr/lib/libc.so.26.2, so=so, useshrplib=true, libperl=libperl.so.6.0
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=define, ccdlflags=' '
    cccdlflags='-DPIC -fPIC ', lddlflags='-shared -fPIC '

• NA Filesys-DiskFree-0.06 i386-openbsd 2.9 by alian