There are three alternative 32-bit compiled Mac OSX executables of the June2013 update: ddlabx11_macPB32 compiled on OSX 10.4.11 (Motorola) PowerPC G4 PowerBook (2005) -- by Andy (andy at ddlab dot org) ddlabx11_macMB32 compiled on OSX 10.5.8 (Intel) MacBook Pro (2009) -- by Dave (noyzelab at gmail dot com) ddlabx11_macML32 compiled on OSX 10.8.2 (Intel) Mountain Lion (2013) -- by Genaro (genaro dot juarez dot martinez at gmail dot com) These compiles are incompatible; please use the executable that matches your Mac. You can also recompile for your Mac computer (or for a 64-bit version), from the source code and Makefile provided in www.ddlab.org. DDLab would appreciate news of alternative compiles. Run from a terminal in X11, which must be installed. ddlabx11_macPB32.tar.gz ddlabx11_macMB32.tar.gz ddlabx11_macML32.tar.gz ... will unpack to give the executable and this readme. To run DDLab, from a terminal in X11, from the directory with the DDLab files, enter the name of the executable preceded by ./ and followed by & ./ddlabx11_macML32 & Alternatively, first change directory to "ddfiles" then enter the name of the executable preceded by ../ and followed by & This will keep files generated by DDLab in the ddfiles subdirectory. ---------------------------------------------------------------------