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我在mac osx上使用自制软件安装gnupg2，并在安装依赖libusb时出现错误。安装gnupg2依赖libusb使用自制软件时出错
brew install gpg2
....
==> Installing gnupg2 dependency: libusb
==> Downloading http://downloads.sourceforge.net/project/libusb/libusb-1.0/libusb-1.0.9/libusb-1.0.9.tar.bz2
Already downloaded: /Library/Caches/Homebrew/libusb-1.0.9.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/libusb/1.0.9
==> make install
os/darwin_usb.c:1749: error: old-style parameter declarations in prototyped function definition
os/darwin_usb.c:1749: error: expected '{' at end of input
make[1]: *** [libusb_1_0_la-darwin_usb.lo] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [install-recursive] Error 1
任何想法如何解决这一问题？
由于