Merge branch 't-nil-master-patch-88790' into 'master'

Provide possible fix for `x86_64-linux-gnu-ar: command not found` (or similar) in README.md

See merge request redox-os/relibc!351

README.md

@@ -3,6 +3,24 @@ relibc is a portable POSIX C standard library written in Rust. It is under heavy
 
 The motivation for this project is twofold: Reduce issues the redox crew was having with newlib, and create a safer alternative to a C standard library written in C. It is mainly designed to be used under redox, as an alternative to newlib, but it also supports linux syscalls via the [sc](https://crates.io/crates/sc) crate.
 
+## Building
+Just run `make all`.
+
+### Issues
+#### I'm building for my own platform which I run, and am getting `x86_64-linux-gnu-ar: command not found` (or similar)
+The Makefile expects the gnu compiler tools prefixed with the platform specifier, as would be present when you'd install a cross compiler. Since you are building for your own platform, some distros (like Manjaro) don't install/symlink the prefixed executables.
+An easy fix would be to replace the corresponding lines in the Makefile, e.g.
+```diff
+ ifeq ($(TARGET),x86_64-unknown-linux-gnu)
+        export CC=x86_64-linux-gnu-gcc
+-       export LD=x86_64-linux-gnu-ld
+-       export AR=x86_64-linux-gnu-ar
++       export LD=ld
++       export AR=ar
+        export OBJCOPY=x86_64-linux-gnu-objcopy
+ endif
+```
+
 ### [Contributing](CONTRIBUTING.md)
 
 ## Supported OSes