Error when I run make

[charbelsako]

cp blocks.def.h blocks.h
cc `pkg-config --cflags x11 --libs x11` dwmblocks.c -o dwmblocks
/bin/sh: 1: pkg-config: not found
/usr/bin/ld: /tmp/ccAfJJlF.o: in function `setroot':
dwmblocks.c:(.text+0x3e1): undefined reference to `XStoreName'
/usr/bin/ld: dwmblocks.c:(.text+0x3f0): undefined reference to `XFlush'
/usr/bin/ld: /tmp/ccAfJJlF.o: in function `setupX':
dwmblocks.c:(.text+0x403): undefined reference to `XOpenDisplay'
/usr/bin/ld: /tmp/ccAfJJlF.o: in function `main':
dwmblocks.c:(.text+0x6c7): undefined reference to `XCloseDisplay'
collect2: error: ld returned 1 exit status
make: *** [Makefile:5: output] Error 1