my $relSourcePath;
my $inlineCFile;
my $inlineBuildDir;
my $libDir;
my $incDir;
BEGIN {
    # this file is in the same directory as the rest of the sources
    $relSourcePath = File::Spec->rel2abs(dirname($0));
    die "Install path must not have spaces.\n" if $relSourcePath =~ /\s/;

    # Need to build the path to the Inline C file here, so that we could
    # reference it below
    my @dirs = ();
    push @dirs, $relSourcePath;
    $inlineCFile = File::Spec->catfile(@dirs, "my_wrapper.c");
    push @dirs, ".Inline";
    $inlineBuildDir = File::Spec->catdir(@dirs);
    pop @dirs;
    push @dirs, "lib";
    $libDir = File::Spec->catdir(@dirs);
    pop @dirs;
    push @dirs, "include";
    $incDir = File::Spec->catdir(@dirs);
}

use Inline (
    C => Config =>
        LIBS      => "-L$libDir -lmylib",
        INC       => "-I$incDir",
        DIRECTORY => $inlineBuildDir,
);

# this is the C source file for interfacing to the library. Yes, this could be
# done natively in Perl, but this is just as easy (and probably faster to
# execute).
use Inline C => "$inlineCFile";

$ENV{MYVAR} = "my_var_value";
print "ENV{MYVAR} = '" . qqq("MYVAR") . "'\n";