Fix build loop for libusb

    set_target_properties(i2c PROPERTIES IMPORTED_LOCATION ${I2C_LIB_PATH})

    include_directories(${I2C_INCLUDE_DIR})

    # Prepare configure script for libusb

    file(WRITE ${EXTERNAL_DIR}/libusb/build/configure_libusb.sh

        "#!/bin/bash

        set -e

        STAMP_FILE=\"${EXTERNAL_DIR}/libusb/stamp/libusb-configured\"

        BUILD_DIR=\"${EXTERNAL_DIR}/libusb/build\"

        SRC_DIR=\"${EXTERNAL_DIR}/libusb/src\"

        INSTALL_DIR=\"${EXTERNAL_DIR}/libusb/install\"

        if [ ! -f \"$STAMP_FILE\" ]; then

            echo \"Running bootstrap and configure...\"

            cd \"$BUILD_DIR\"

            \"$SRC_DIR\"/bootstrap.sh

            \"$SRC_DIR\"/configure --disable-udev --enable-static --disable-shared --prefix=\"$INSTALL_DIR\"

            touch \"$STAMP_FILE\"

        else

            echo \"Skipping configure: stamp exists\"

        fi

    ")

    file(CHMOD ${EXTERNAL_DIR}/libusb/build/configure_libusb.sh PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ)

    # Download and build libusb

    ExternalProject_Add(

        libusb

        GIT_REPOSITORY https://github.com/libusb/libusb.git

        GIT_TAG v1.0.27

        PREFIX ${EXTERNAL_DIR}/libusb

        SOURCE_DIR ${EXTERNAL_DIR}/libusb/src

        STAMP_DIR ${EXTERNAL_DIR}/libusb/stamp

        CONFIGURE_COMMAND pwd && ./bootstrap.sh && ./configure --disable-udev --enable-static --disable-shared --prefix=${EXTERNAL_DIR}/libusb/install

        BINARY_DIR ${EXTERNAL_DIR}/libusb/build

        INSTALL_DIR ${EXTERNAL_DIR}/libusb/install

        CONFIGURE_COMMAND

            bash ${EXTERNAL_DIR}/libusb/build/configure_libusb.sh            

        BUILD_COMMAND make -j4

        BUILD_IN_SOURCE 1

        # BUILD_IN_SOURCE 1

        INSTALL_COMMAND ""

    )

    ExternalProject_Get_Property(libusb BINARY_DIR)