sth wrong

szczepancio@VirtualMint ~/rockbox/utils/imxtools/sbtools $ make
gcc -O3 -g -std=c99 -W -Wall `pkg-config --cflags libusb-1.0` -DCRYPTO_LIBUSB -c -o elftosb.o elftosb.c
Package libusb-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libusb-1.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libusb-1.0' found
elftosb.c: In function ‘load_bin_by_id’:
elftosb.c:116:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
gcc -O3 -g -std=c99 -W -Wall `pkg-config --cflags libusb-1.0` -DCRYPTO_LIBUSB -c -o crc.o crc.c
Package libusb-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libusb-1.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libusb-1.0' found
gcc -O3 -g -std=c99 -W -Wall `pkg-config --cflags libusb-1.0` -DCRYPTO_LIBUSB -c -o crypto.o crypto.c
Package libusb-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libusb-1.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libusb-1.0' found
crypto.c:25:20: fatal error: libusb.h: No such file or directory
compilation terminated.
make: *** [crypto.o] Error 1