make:execvp:gcc:权限被拒绝

我正试图使用make-f Makefile创建一个文件，但我收到了以下错误：

root@kevin-VirtualBox:/home/kevin/Desktop/makef# sudo -s make -f Makefile
gcc -c -o obj/main.o main.c -I./
make: execvp: gcc: Permission denied
make: *** [obj/main.o] Error 127

--制作文件代码：

IDIR =./
CC=gcc
CFLAGS=-I$(IDIR)
ODIR=obj
LDIR =./
LIBS=-lgd -lrt
_DEPS = main.h Makefile
DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))
_OBJ = main.o serial.o fb.o menu_main.o timer.o cmdin.o buzzer.o statemachine.o inout.o network.o text_file_input.o text_file_input_oven.o
OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))

$(ODIR)/%.o: %.c $(DEPS)
    $(CC) -c -o $@ $< $(CFLAGS)
main: $(OBJ)
    gcc -o $@ $^ $(CFLAGS) $(LIBS)
.PHONY: clean
clean:
    rm -f $(ODIR)/*.o *~ core $(INCDIR)/*~ 

运行gcc程序后出错：

root@kevin-VirtualBox://home/kevin/Desktop/makef# make -f Makefile
gcc -c -o obj/main.o main.c -I./
make: execvp: gcc: Permission denied
make: *** [obj/main.o] Error 127
root@kevin-VirtualBox://home/kevin/Desktop/makef# make -f Makefile
gcc -c -o obj/main.o main.c -I./
make: gcc: Command not found
make: *** [obj/main.o] Error 127
root@kevin-VirtualBox://home/kevin/Desktop/makef# mv gcc gcOld^C
root@kevin-VirtualBox://home/kevin/Desktop/makef# make -f Makefile
gcc -c -o obj/main.o main.c -I./
gcc -c -o obj/serial.o serial.c -I./
gcc -c -o obj/fb.o fb.c -I./
gcc -c -o obj/menu_main.o menu_main.c -I./
gcc -c -o obj/timer.o timer.c -I./
gcc -c -o obj/cmdin.o cmdin.c -I./
cmdin.c: In function ‘processcmd’:
cmdin.c:65:4: warning: format ‘%f’ expects argument of type ‘float *’, but argument 4 has type ‘int *’ [-Wformat]
gcc -c -o obj/buzzer.o buzzer.c -I./
gcc -c -o obj/statemachine.o statemachine.c -I./
gcc -c -o obj/inout.o inout.c -I./
gcc -c -o obj/network.o network.c -I./
gcc -c -o obj/text_file_input.o text_file_input.c -I./
text_file_input.c: In function ‘text_file_input’:
text_file_input.c:43:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input.c:44:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input.c:45:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input.c:175:5: warning: format not a string literal and no format arguments [-Wformat-security]
gcc -c -o obj/text_file_input_oven.o text_file_input_oven.c -I./
text_file_input_oven.c: In function ‘text_file_input_oven’:
text_file_input_oven.c:43:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input_oven.c:44:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input_oven.c:45:3: warning: format not a string literal and no format arguments [-Wformat-security]
text_file_input_oven.c:112:5: warning: format not a string literal and no format arguments [-Wformat-security]
gcc -o main obj/main.o obj/serial.o obj/fb.o obj/menu_main.o obj/timer.o obj/cmdin.o obj/buzzer.o obj/statemachine.o obj/inout.o obj/network.o obj/text_file_input.o obj/text_file_input_oven.o -I./ -lgd -lrt
/usr/bin/ld: cannot find -lgd
collect2: ld returned 1 exit status
make: *** [main] Error 1