nac@nac-dev-debian9:~/.cpan/build/HTTP-Headers-Fast-0.21-2$ ./Build test
t/00_compile.t .............. ok   
t/01-compat.t ............... ok   
t/02-isa.t .................. ok   
t/as_string_without_sort.t .. ok   
t/charset.t ................. ok   
t/headers.t ................. ok       
t/headers_psgi_flatten.t .... ok     
t/lazy_load_for_storable.t .. 1/1 
#   Failed test at t/lazy_load_for_storable.t line 6.
#          got: '/home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/lib/perl5/site_perl/5.28.1/x86_64-linux/Storable.pm'
#     expected: undef
# Looks like you failed 1 test of 1.
t/lazy_load_for_storable.t .. Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/1 subtests 

Test Summary Report
-------------------
t/lazy_load_for_storable.t (Wstat: 256 Tests: 1 Failed: 1)
  Failed test:  1
  Non-zero exit status: 1
Files=8, Tests=195,  1 wallclock secs ( 0.05 usr  0.01 sys +  0.61 cusr  0.05 csys =  0.72 CPU)
Result: FAIL

nac@nac-dev-debian9:~/.cpan/build/HTTP-Headers-Fast-0.21-2$ perl -V
Summary of my perl5 (revision 5 version 28 subversion 1) configuration:
   
  Platform:
    osname=linux
    osvers=4.9.0-8-amd64
    archname=x86_64-linux
    uname='linux nac-dev-debian9 4.9.0-8-amd64 #1 smp debian 4.9.130-2 (2018-10-27) x86_64 gnulinux '
    config_args='-Dprefix=/home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1 -de -Dversiononly -Duserelocatableinc -A'eval:scriptdir=/home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/bin''
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='6.3.0 20170516'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/6/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.24.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.24'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Locally applied patches:
    Devel::PatchPerl 1.52
  Built under linux
  Compiled at Jan 22 2019 14:32:10
  %ENV:
    PERL5LIB=""
    PERL5OPT=""
    PERL5_CPANPLUS_IS_RUNNING="5329"
    PERL5_CPAN_IS_RUNNING="5329"
  @INC:
    /home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/lib/perl5/site_perl/5.28.1/x86_64-linux
    /home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/lib/perl5/site_perl/5.28.1
    /home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/lib/perl5/5.28.1/x86_64-linux
    /home/nac/.plenv/versions/CIS-Debian9-Perl5.28.1/lib/perl5/5.28.1