root@zynthian-amp2:/zynthian/zynthian-sw/plugins/rbdrum2midi# mkdir build
root@zynthian-amp2:/zynthian/zynthian-sw/plugins/rbdrum2midi# cd build
root@zynthian-amp2:/zynthian/zynthian-sw/plugins/rbdrum2midi/build# cmake ..
-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.28")
-- Checking for module 'jack'
--   Found jack, version 1.9.10
-- Found Jack: /usr/lib/arm-linux-gnueabihf/libjack.so
-- Found ALSA: /usr/lib/arm-linux-gnueabihf/libasound.so (found version "1.0.28")
CMake Warning (dev) at src/CMakeLists.txt:16 (link_directories):
  This command specifies the relative path

    LIBUSB_1_INCLUDE_DIR-NOTFOUND

  as a link directory.

  Policy CMP0015 is not set: link_directories() treats paths relative to the
  source dir.  Run "cmake --help-policy CMP0015" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
LIBUSB_1_INCLUDE_DIR
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
   used as include directory in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src
LIBUSB_1_LIBRARY
    linked by target "rbdrum2midi" in directory /zynthian/zynthian-sw/plugins/rbdrum2midi/src

-- Configuring incomplete, errors occurred!
See also "/zynthian/zynthian-sw/plugins/rbdrum2midi/build/CMakeFiles/CMakeOutput.log".
root@zynthian-amp2:/zynthian/zynthian-sw/plugins/rbdrum2midi/build#