On Thu, Jun 12, 2014 at 01:59:02PM +0200, Ludovic Court??s wrote: Hello! Lastly, prefer adding a phase before ???build??? rather than replacing ???build??? just to call it afterwards. So, like this: (alist-cons-before 'build 'pre-build (lambda ... ... (with-output-to-file our-catalog (lambda () ...)) #t) %standard-phases) I'm not sure if this will work. I need to set an environment variable, and presumably 'build and 'pre-build run in separate environments? J' -- PGP Public key ID: 1024D/2DE827B3 fingerprint = 8797 A26D 0854 2EAB 0285 A290 8A67 719C 2DE8 27B3 See http://sks-keyservers.net or any PGP keyserver for public key.