Load math for Travis CI

sunzenshen · sunzenshen · commit 9e4fc755c840 · 2015-03-16T18:15:15.000-06:00
For resolving build error in Travis CI environment: https://travis-ci.org/sunzenshen/go-build-your-own-lisp/builds/54618585
diff --git a/mpc/mpc_interface.go b/mpc/mpc_interface.go
@@ -1,5 +1,6 @@
 package mpc
 
+// #cgo LDFLAGS: -lm
 // #include "mpc_interface.h"
 import "C"
 import (
