The white space between ']' and ']' is necessary or else flex will discard all closing braces and brackets of the corresponding line in docify.cc. Patch required with flex version 2.5.31, not required with 2.5.4a. --- doc++-3.4.10/src/docify.ll 2001-03-08 08:36:20.000000000 +0000 +++ doc++-3.4.10-patched/src/docify.ll 2004-01-13 22:12:27.000000000 +0000 @@ -314,7 +314,7 @@ { if(argv[1][0] == '-') { - fprintf(stderr, "Usage: docify [infile [outfile]]\n"); + fprintf(stderr, "Usage: docify [ infile [ outfile ] ]\n"); return 0; } ain = fopen(argv[1], "r");