env["DYLD_LIBRARY_PATH"] = os.path.join(self.bin_root(), "lib") + \
(os.pathsep + env["DYLD_LIBRARY_PATH"]) \
if "DYLD_LIBRARY_PATH" in env else ""
+ env["LIBRARY_PATH"] = os.path.join(self.bin_root(), "lib") + \
+ (os.pathsep + env["LIBRARY_PATH"]) \
+ if "LIBRARY_PATH" in env else ""
env["PATH"] = os.path.join(self.bin_root(), "bin") + \
os.pathsep + env["PATH"]
if not os.path.isfile(self.cargo()):