Proj has the funny build process where you have to untar the nadcon grids into the source tree before building. If you forget that step, your proj won't have the grids available for conversion. P On 19-Oct-07, at 2:03 PM, Brian Timoney wrote: > Was whatever does the datum shifts between NAD27 and NAD83 not > included in more recent builds of PROJ? Is it a 4.5 issue?