fel_lib.c:26:10: fatal error: 'libusb.h' file not found

[RaspberryPiDude314159]

I'm running this on Big Sur and after trying to use the "Make" command, I got this error:
cc -std=c99 -Wall -Wextra -Wno-unused-result -D_POSIX_C_SOURCE=200112L -D_BSD_SOURCE -D_DEFAULT_SOURCE -Iinclude/ `pkg-config --cflags libusb-1.0` `pkg-config --cflags zlib` -o sunxi-fel \ fel.c progress.c soc_info.c fel_lib.c `pkg-config --libs libusb-1.0` `pkg-config --libs zlib` /bin/sh: pkg-config: command not found /bin/sh: pkg-config: command not found /bin/sh: pkg-config: command not found /bin/sh: pkg-config: command not found fel_lib.c:26:10: fatal error: 'libusb.h' file not found #include <libusb.h> ^~~~~~~~~~ 1 error generated. make[1]: *** [sunxi-fel] Error 1 make: *** [3rdparty/sunxi-tools/sunxi-fel] Error 2
Does anyone know a fix?
Thanks in advance!