YES. Here is an example. I created a simple ( h2xs -XA FOO ) package (no XS) and ran make -n testdb TEST_FILE=t/1.t the -n tells make to report what it would do if it were to run (which it doesn't)

$make -n testdb TEST_FILE=t/2.t
/nfs/mu/apps/perl/5.8.4/bin/perl "-MExtUtils::Command" -e mkpath \
  blib/lib blib/lib/auto/FOO \
  blib/arch/auto/FOO blib/bin \
  blib/script blib/man1 \
  blib/man3
chmod 755 \
  blib/lib blib/lib/auto/FOO \
  blib/arch/auto/FOO blib/bin \
  blib/script blib/man1 \
  blib/man3
touch blibdirs
/bin/sh -c true
/nfs/mu/apps/perl/5.8.4/bin/perl -MExtUtils::Install -e 'pm_to_blib({@
+ARGV}, '\''blib/lib/auto'\'', '\'''\'')' \
  FOO.pm blib/lib/FOO.pm
touch pm_to_blib
/bin/sh -c true
/bin/sh -c true
/bin/sh -c true
/bin/sh -c true
PERL_DL_NONLAZY=1 /nfs/mu/apps/perl/5.8.4/bin/perl -d "-Iblib/lib" "-I
+blib/arch" t/2.t
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Notice the last line:

PERL_DL_NONLAZY=1 /nfs/mu/apps/perl/5.8.4/bin/perl -d "-Iblib/lib" "-Iblib/arch" t/2.t

This calls perl with blib/lib and blib/arch ahead of everything else in the @INC list of package directories to search. This will ensure that the package(s) you are testing are picked up before whatever else is in @INC.

For example, heres a test that will report what @INC has:

# Before `make install' is performed this script should be runnable wi
+th
# `make test'. After `make install' it should work as `perl 1.t'
 
#########################
 
# change 'tests => 1' to 'tests => last_test_to_print';
 
use Test::More tests => 1;
 
print join("\n", @INC);
ok(1);
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Now when I run this using the make:

$make testdb TEST_FILE=t/2.t
PERL_DL_NONLAZY=1 /nfs/mu/apps/perl/5.8.4/bin/perl -d "-Iblib/lib" "-I
+blib/arch" t/2.t
Reading ~/.perldb options.
 
Loading DB routines from perl5db.pl version 1.25
Editor support available.
 
Enter h or `h h' for help, or `man perldebug' for more help.
 
1..1
main::(t/2.t:10):       print join("\n", @INC);
  DB<1> c
blib/lib
blib/arch
/home/memyselfandi/lib
/foo/apps/perl/5.8.4/lib
/foo/sdk/perl/5.8.4/sitelib/prod/lib
/foo/foofoo/corplib/gcc331/prod/perllib/lib
.ok 1
Debugged program terminated.  Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.
  DB<1> q
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