I have got the following warning messages: $ jam>outlog1 cgats\cgats.c: In function 'add_data_item': cgats\cgats.c:1229:18: warning: assignment from incompatible pointer type cgats\cgats.c:1236:29: warning: assignment from incompatible pointer type tiff\libtiff\tif_msdos.c:125:14: warning: conflicting types for built-in function 'malloc' tiff\libtiff\tif_msdos.c:126:14: warning: conflicting types for built-in function 'realloc' tiff\libtiff\tif_msdos.c: In function '_TIFFfree': tiff\libtiff\tif_msdos.c:140:2: warning: incompatible implicit declaration of built-in function 'free' cgats\cgats.c: In function 'add_data_item': cgats\cgats.c:1229:18: warning: assignment from incompatible pointer type cgats\cgats.c:1236:29: warning: assignment from incompatible pointer type Also it seems to me that there should be a config.h in Argyll_V1.3.3_beta\libusb1 so I made a copy from Argyll_V1.3.2\libusb1. I should have said that I know almost nothing about programming. tmwu