Dave, It appears that your system doesn't have the function clock_gettime(). Indeed, OS X doesn't appear to have that function. I replaced the use of that function with gettimeofday() in the the LDM source-code. gettimeofday() appears to be supported on more platforms than clock_gettime(). I downloaded the new version of the LDM from ftp://ftp.unidata.ucar.edu/pub/ldm/beta/ldm-6.13.1.3.tar.gz and installed it (including root actions). It should be ready to go; just throw the "runtime" switch: cd && ldmadmin stop && rm runtime && ln -s ldm-6.13.1.3 runtime && ldmadmin start This final step should be done by you so that you can verify behavior and revert if necessary. Please keep me apprised. Regards, Steve Emmerson Ticket Details =================== Ticket ID: EJF-472056 Department: Support LDM Priority: Normal Status: Closed