Andrew, should be better to create a separate package libargp-devel for the development portion ?
$ cygcheck -l libargp /usr/bin/cygargp-0.dll /usr/include/argp.h /usr/lib/libargp.dll.a /usr/share/doc/Cygwin/libargp.README /usr/share/doc/libargp/COPYING /usr/share/doc/libargp/COPYING.LESSER /usr/share/doc/libargp/README.Cygwin the libargp should contain only: /usr/bin/cygargp-0.dll Regards MArco