Device::SerialPort Brain Problems

wm1ke has asked for the wisdom of the Perl Monks concerning the following question:

I play with perl and enjoy it but modules and installing them jut do not seem to fit with my old brain. I am trying to install Device::SerialPort on my Ubuntu box. After using cpanm I was told:

Device::SerialPort is up to date.(1.04)
mike@BlsckBox:~/ham$
[download]

When I try to run the code I get the message :

perl radio.pl Can't locate Device/SerialPort.pm in @INC (you may need 
+to install the Device::SerialPort module) (@INC contains: /etc/perl /
+usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/share/perl/5.22
+.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 /usr/share/perl5 /usr/lib/x86
+_64-linux-gnu/perl/5.22 /usr/share/perl/5.22 /usr/local/lib/site_perl
+ /usr/lib/x86_64-linux-gnu/perl-base .) at radio.pl line 6. BEGIN fai
+led--compilation aborted at radio.pl line 6.
[download]

Here is the faulting code:

#
# Control access to an ICOM radio
#

use vars qw( $ob $port );
use Device::SerialPort;
use sigtrap qw(INT SIGINT);
$ob = new Device::SerialPort ("/dev/ttyUSB0", 1);
[download]

I get off my wheel chair and knell on the floor before the monks to help an old man who appreciates it.

Comment on Device::SerialPort Brain Problems Select or Download Code

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Re: Device::SerialPort Brain Problems by tybalt89 (Monsignor) on Mar 27, 2017 at 00:52 UTC
use `locate SerialPort.pm` [download] to find out where it actually is (like /somepath/Device/SerialPort.pm ), and then `use lib '/somepath';` [download] to allow your program to find it.	[reply] [d/l] [select]
Re: Device::SerialPort Brain Problems by haukex (Archbishop) on Mar 27, 2017 at 08:06 UTC
Two different installations of Perl perhaps? Try comparing the outputs of the following with the shebang (`#!`) line at the top of the script. `$ which cpanm $ which perl $ perl -le 'print $^X'` [download]	[reply] [d/l] [select]
Re^2: Device::SerialPort Brain Problems by wm1ke (Initiate) on Mar 29, 2017 at 01:47 UTC
As Demonstrated in the code above, I do not list a path to perl in my code, making it a little more portable among all the little cheap devices I play with. The result of the querying was: `mike@BlsckBox:~/Desktop$ which cpanm /usr/bin/cpanm mike@BlsckBox:~/Desktop$ which perl /usr/bin/perl mike@BlsckBox:~/Desktop$ perl -le 'print $^X' /usr/bin/perl mike@BlsckBox:~/Desktop$` [download] Thanks for putting up with this old 70s freak.	[reply] [d/l]
Re^3: Device::SerialPort Brain Problems (updated) by haukex (Archbishop) on Mar 29, 2017 at 07:29 UTC
Hm, so it looks like you're using the system Perl. ~~I assume your scripts also start with the line "`#!/usr/bin/perl`"?~~ Then question then is why `cpanm Device::SerialPort` shows the module is installed. Perhaps you're using a not fully configured local::lib? Did you try looking for the `SerialPort.pm` file like tybalt89 suggested? Also, if you could show the output of the following commands. `$ echo $PERL5LIB $ echo $PERL_MB_OPT $ echo $PERL_MM_OPT $ echo $INSTALL_BASE` [download] Update: I struck the question that I missed your answer to before. Also, I should say that modifying the system Perl with `cpan` or `cpanm` is not necessarily recommended, since it's possible for failed module installations to mess up the system Perl and potentially all the system tools that rely on it. It usually is ok to install modules into the system Perl with the system's package manager though, so on Ubuntu you could use `sudo apt-get install libdevice-serialport-perl`. Either that, or you could use local::lib to install modules in your home directory, or you could even use perlbrew to install your own local copy of Perl that you can install all the modules you like, plus you'd get the newest version of Perl available.	[reply] [d/l] [select]
Re^2: Device::SerialPort Brain Problems by wm1ke (Initiate) on Mar 28, 2017 at 02:03 UTC
Surgery This week. Hope I can play with the code next week. Thanks for the help everyone! wm1ke	[reply]
Re: Device::SerialPort Brain Problems by dazz (Beadle) on Mar 27, 2017 at 08:11 UTC
Hi If you run Ubuntu and you are trying to install modules from CPAN, you need to first install build-essential, automake and checkinstall. Only then can you use CPAN.	[reply]
Re: Device::SerialPort Brain Problems by Anonymous Monk on Mar 27, 2017 at 00:58 UTC
What is @INC under cpanm? Why is @INC under cpanm different from your regular @INC?	[reply]