Dear R-devel, It seems the quantreg package on AIX5.3 is not working. I used "R CMD INSTALL quantreg_4.36.tar.gz" to install it with R 2.8.1. Error in dyn.load(file, DLLpath = DLLpath, ...) : unable to load shared library '/home/R281/AIX53/lib/R/./library/quantreg/libs/quantreg.so': rtld: 0712-001 Symbol etime was referenced from module /home/R281/AIX53/lib/R/./library/quantreg/libs/quantreg.so(), but a runtime definition of the symbol was not found. rtld: 0712-002 fatal error: exiting. Error: The R quantreg package is required but could not be loaded. The symbol "etime" is not implemented. I Google the issue and get a useful suggestion to add a etime.c to the package source code. And it fix the above fail. /* /* etime.c /* #include <sys/time.h> #include <sys/resource.h> float etime(tt) float tt[2]; { int who; struct rusage used; who = 0; getrusage(who,&used); /* tt[0] = used.ru_exutime.tv_sec+((used.ru_exutime.tv_usec)/1000000.); */ tt[0] = used.ru_utime.tv_sec+((used.ru_utime.tv_usec)/1000000.); tt[1] = used.ru_stime.tv_sec+((used.ru_stime.tv_usec)/1000000.); return(tt[0]+tt[1]); } Is this a bug? Thanks, Fan Long [[alternative HTML version deleted]]