Unable to build on Mac with MacPorts libgit2 about exa HOT 3 CLOSED

   Compiling regex_macros v0.1.8
/Users/rpg/.cargo/registry/src/github.com-1ecc6299db9ec823/regex_macros-0.1.8/src/lib.rs:29:45: 29:52 error: unresolved import `syntax::ext::base::MacExpr`. There is no `MacExpr` in `syntax::ext::base`
/Users/rpg/.cargo/registry/src/github.com-1ecc6299db9ec823/regex_macros-0.1.8/src/lib.rs:29 use syntax::ext::base::{ExtCtxt, MacResult, MacExpr, DummyResult};
                                                                                                                                        ^~~~~~~
error: aborting due to previous error
Could not compile `regex_macros`.