I'm running tests which are in a ./t subdirectory. Tests are failing with "Can't locate so-and-so in @INC", despite the fact that the missing module is in the first directory named in the dump of @INC. I have $PERL5LIB set. Thus:

# echo $PERL5LIB
/home/henry/gitr/MAS/lib 

# prove ./t/8bit.t
./t/8bit.t .. Can't locate MAS::Global in @INC (@INC entries checked: 
+/home/henry/gitr/MAS/lib /etc/perl (... others omitted)

# find /home/henry/gitr/MAS/lib -name Global.pm
/home/henry/gitr/MAS/lib/MAS/Global.pm  # It's in $INC[0]

# perl -c /home/henry/gitr/MAS/lib/MAS/Global.pm
/home/henry/gitr/MAS/lib/MAS/Global.pm syntax OK

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Perl itself can find it:

# perldoc -l MAS::Global
/home/henry/gitr/MAS/lib/MAS/Global.pm

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Compiler and OS details

# perl -v
This is perl 5, version 38, subversion 2 (v5.38.2) built for x86_64-li
+nux-gnu-thread-multi
(with 51 registered patches, see perl -V for more detail)

# cat /etc/os-release 
NAME="Linux Mint"
VERSION="22.2 (Zara)"
ID=linuxmint
ID_LIKE="ubuntu debian" ... etc

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I'm fairly sure there's a sensible explanation for this baffling behaviour: would someone either diagnose my error, or suggest some way by which I can home in on what it is?

In reply to prove can't find my module, even though its directory is in $INC[0] by HenryLaw

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