Compile errors on Crostini Debian

On Crostini Debian, I can't quite get the thing to compile. Every time I try I get 
```
/usr/bin/ld: ../lib/libran.a(ranlib.o): warning: relocation against `fputc@@GLIBC_2.2.5' in read-only section `.text'
```
for some unknown reason.

 I've tried adding -Wno-error and -w to the CFLAGS, but it doesn't seem to change anything. what could be causing this?