I think the error means the module is trying to perform a concatenation and one of the variables it is attempting to use is undefined. This is definitely the case with $ENV{LIBUSB_LIBDIR}, it is undefined.
Device::USB is a cpan module, rather than trying to get rid of the variable I think I should ascertain what its value should be
root@gk-kubuntu-dev:~/dav/Nevada# find / -name libusb* /lib/firmware/carl9170fw/extra/libusb-zeropacket.diff /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4 /lib/x86_64-linux-gnu/libusb-0.1.so.4 /lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0 /lib/x86_64-linux-gnu/libusb-1.0.so.0 /var/cache/apt/archives/libusb-1.0-0-dbg_2%3a1.0.16-3_amd64.deb /var/cache/apt/archives/libusb-1.0-0-dev_2%3a1.0.16-3_amd64.deb /var/cache/apt/archives/libusb-1.0-doc_2%3a1.0.16-3_all.deb /var/lib/dpkg/info/libusb-0.1-4:amd64.shlibs /var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.list /var/lib/dpkg/info/libusb-1.0-0:amd64.md5sums /var/lib/dpkg/info/libusb-0.1-4:amd64.symbols /var/lib/dpkg/info/libusb-1.0-0:amd64.postrm /var/lib/dpkg/info/libusbmuxd2.symbols /var/lib/dpkg/info/libusb-0.1-4:amd64.postrm /var/lib/dpkg/info/libusb-1.0-0:amd64.postinst /var/lib/dpkg/info/libusbmuxd2.postinst /var/lib/dpkg/info/libusb-1.0-0:amd64.shlibs /var/lib/dpkg/info/libusb-0.1-4:amd64.postinst /var/lib/dpkg/info/libusbmuxd2.md5sums /var/lib/dpkg/info/libusb-1.0-doc.list /var/lib/dpkg/info/libusbmuxd2.postrm /var/lib/dpkg/info/libusb-1.0-0-dev:amd64.list /var/lib/dpkg/info/libusb-1.0-doc.md5sums /var/lib/dpkg/info/libusb-1.0-0-dev:amd64.md5sums /var/lib/dpkg/info/libusb-1.0-0:amd64.list /var/lib/dpkg/info/libusb-1.0-0:amd64.symbols /var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.md5sums /var/lib/dpkg/info/libusbmuxd2.shlibs /var/lib/dpkg/info/libusb-0.1-4:amd64.list /var/lib/dpkg/info/libusbmuxd2.list /var/lib/dpkg/info/libusb-0.1-4:amd64.md5sums /usr/share/doc-base/libusb-1.0-doc /usr/share/doc/libusb-1.0-0 /usr/share/doc/libusb-1.0-0-dev /usr/share/doc/libusb-0.1-4 /usr/share/doc/libusb-1.0-doc /usr/share/doc/libusb-1.0-doc/html/libusb_8h_source.html /usr/share/doc/libusb-1.0-0-dbg /usr/share/doc/libusbmuxd2 /usr/lib/libusbmuxd.so.1.0.8 /usr/lib/libusbmuxd.so.2 /usr/lib/x86_64-linux-gnu/libusb-1.0.so /usr/lib/x86_64-linux-gnu/libusb-1.0.a /usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc /usr/lib/debug/lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0 /usr/include/libusb-1.0 /usr/include/libusb-1.0/libusb.h
I chose /lib/x86_64-linux-gnu/ and /usr/include/ and assigned the values to $ENV{LIBUSB_LIBDIR}, neither of which worked.
Is it possible that there a missing symlink someplace that should point to libusb(somethingorother)? The code from USB.pm is as follows:
9 use Inline ( 10 C => "DATA", 11 ($ENV{LIBUSB_LIBDIR} 12 ? ( LIBS => "-L\"$ENV{LIBUSB_LIBDIR}\" " . 13 ($^O eq 'MSWin32' ? ' -llibusb -L\"$ENV{W +INDDK}\\lib\\crt\\i386\" -lmsvcrt ' : '-lusb') ) 14 : ( LIBS => '-lusb', ) 15 ), 16 ($ENV{LIBUSB_INCDIR} ? ( INC => "-I\"$ENV{LIBUSB_INCDIR}\ +"" ) : () ), 17 NAME => 'Device::USB', 18 VERSION => '0.35', 19 CCFLAGS => "$Config{ccflags} $ENV{CFLAGS} $ENV{CPPFLAGS}" +, 20 LDDLFLAGS => "$Config{lddlflags} $ENV{LDFLAGS}", 21 ); 22 23 Inline->init();
I don't recognize what it is. Is it bash code to set up the environment? This is fascinating: I commented out lines 11,12,13,14,15 and the error persists. What is most interesting is that in that section the only concatenation operator is on line 12, and even commented out the error persists. This indicates the error is elsewhere, bu there are no further concatenations in the USB.pm file.
In reply to Re^2: Device::USB gives "Use of uninitialized value in concatenation" error
by holandes777
in thread Device::USB gives "Use of uninitialized value in concatenation" error
by holandes777
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