I have issues building my project on C, and I have created minimal build to reproduce the issue. Project uses .a archive for linking, the error: linker-test$ make gcc -Wall -g -c -o main.o main.c gcc -Wall -g -c -o ar-test1.o ar-test1.c gcc -Wall -g -c -o ar-test2.o ar-test2.c ar rcs libartest.a ar-test1.o ar-test2.o gcc -Wall -g -o myapp main.o -L. -lartest ld: archive member '/' not a mach-o file in '/Users/serg/temp/temp/linker-test/libartest.a' clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [myapp] Error 1 Archive to try: https://file.io/OomLs7yTSAnz Files: Makefile: CC = gcc CFLAGS = -Wall -g # List of source files and object files SRCS = main.c OBJS = $(SRCS:.c=.o) # Archive name LIBRARY = libartest.a all: myapp myapp: $(OBJS) $(LIBRARY) $(CC) $(CFLAGS) -o $@ $(OBJS) -L. -lartest $(LIBRARY): ar-test1.o ar-test2.o ar rcs $(LIBRARY) ar-test1.o ar-test2.o %.o: %.c $(CC) $(CFLAGS) -c -o $@ $< clean: rm -f myapp $(OBJS) $(LIBRARY) *.o .PHONY: all clean ar-test1.c: #include <stdio.h> void ar_test1() { printf("This is ar-test1.c\n"); } ar-test2.c: #include <stdio.h> void ar_test2() { printf("This is ar-test2.c\n"); } main.c: #include <stdio.h> int main() { printf("Hello, world!\n"); return 0; }