How to Make Libusb Library Visible to Another Program

How to make libusb library visible to another program?

Since you installed to /usr/local/lib, pkg-config will not find your installation unless you set PKG_CONFIG_PATH appropriately

Try running:

export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig"

in your shell and then re-attempting to build your code

libusb not visible in IDE

Seems like libusb-dev is missing.

Or

Execute dpkg -L libusb-dev to list all the files in libusb-dev package to find out what is appropriate include file name and it's location. Most likely you will end up changing your include to:

#include <usb.h>

Also, it is not enough just to add a header to the program - you need to show what library should be linked to use those symbols that are declared in the header. Add following to your compiler options:

-lusb

Compiling against libusb-dev on Ubuntu

This is what I had to do on Debian. It should be at least similar in Ubuntu.

Install libusb-1.0-0-dev

Instead of:

#include <libusb/libusb.h>

do:

#include <libusb.h>

Compile with:

gcc example.c `pkg-config --libs --cflags libusb-1.0`

Package libusb was not found in the pkg-config search path

Just run:

pkg-config --cflags --libs /usr/local/Cellar/libusb/1.0.20/lib/pkgconfig/libusb-1.0.pc

Problem with Makefile compilation on Ubuntu, -lhidapi-libusb library

What you're trying to do doesn't make sense, and will not work.

libusb and HIDAPI are userspace libraries. They cannot be used within a kernel module.

Adding libusb library to a Qt project in osx

Forming my comment into a proper answer; this is not the correct syntax to use:

LIBS += -L/usr/local/lib -libusb-1.0.a
LIBS += -L<libusb.h>

The proper one would be this:

LIBS += -L/usr/local/lib -lusb-1.0

or

LIBS += -l/full/path/to/libusb-1.0.a

You can drop the second LIBS line in your initial attempt because you have already specified the path in the former, and putting an "include" statement in there would not be reasonable anyhow. So, this is what you could write for your complete .pro file:

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

INCLUDEPATH +=/usr/local/include/libusb-1.0
LIBS += -L/usr/local/lib -lusb-1.0

This is not Qt specific, just generic linkage issue: -lfoo extends to $(prefix)foo$(suffix), where the prefix and suffix are figured out automatically based on the platform. That is, the prefix would be lib in your case, and suffix would be either .a or .so on Unix, probably .dylib on Mac, etc.

You may wish to look into pkg-config support if it is possible to establish. In that case, you would write something like this what we did in QtSerialPort:

CONFIG += link_pkgconfig
PKGCONFIG += libudev

Yet another option is to add the GUI through the QtCreator IDE or similar IDE that you may be using. There is an option usually in the "Linker" section to add a library. Here are two screenshots from my QtCreator:

Click on the project name on the left in the project source tree navigator, and select Add Library. Then the first screenshot will come up, and you can select the external option, and then you can see the second.

It is needless to say that you would need to run qmake after these changes to generate the corresponding Makefile on your desired platform.

Compiling a gcc library with 1.0 in name from powershell

Try with (double) quotes around the -lusb-1.0 parameter.

Can't figure out how to link C++ package I want to compile to a library

Ubuntu 18.04 example : Build in /home/name/tmp/

sudo apt install python3-pygments libsnappy-dev libgmp-dev

Downloaded from Ubuntu 20.04 https://packages.ubuntu.com/focal/libdeflate-dev →
sudo gdebi libdeflate0_1.5-3_amd64.deb && sudo gdebi libdeflate-dev_1.5-3_amd64.deb

Installed gcc94-c++_9.4.0-9_amd64.deb https://drive.google.com/file/d/1xTbHe8ktjKR2gSmQ0Qcw0WEuMoKR8s_w/view?usp=sharing → sudo gdebi gcc94-c++_9.4.0-9_amd64.deb

git clone https://gitlab.com/german.tischler/libmaus2.git
cd libmaus2/
libtoolize && aclocal && autoheader && automake --add-missing && autoconf
export CC=gcc94 CXX=g++94 && ./configure --prefix=/usr libdir=/usr/lib/x86_64-linux-gnu
make
sudo make install-strip

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git clone https://gitlab.com/german.tischler/biobambam2.git
cd biobambam2/
libtoolize && aclocal && autoheader && automake --add-missing && autoconf
export CC=gcc94 CXX=g++94 && ./configure
make
sudo make install-strip

No errors.

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