Hi, I'm not subscribed to this list but noticed the NPTL discussion on Wine Traffic #170. I saw a lot of people mentioning to make it a compile-time option, but no one with a definitive runtime check. Valgrind went through the same problem and I proposed a solution on their list. AFAIK they're not using it, they still have a run-time parameter instead of auto-detecting it on loadtime. The discussion is here: http://sourceforge.net/mailarchive/forum.php?thread_id=2027895&forum_id=3203... http://sourceforge.net/mailarchive/forum.php?thread_id=2052985&forum_id=3203... And a couple of lines to check what threading library is used: //#define _XOPEN_SOURCE #define _POSIX_C_SOURCE 2 #include <unistd.h> #include <stdio.h> int main(void) { char *buf; size_t n; n=confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, (size_t) 0); if ((buf = (char *) malloc(n)) == NULL) abort(); confstr(_CS_GNU_LIBPTHREAD_VERSION, buf, n); fprintf(stdout, "%s\n", buf); exit(0); } Which is basicly the same as: getconf GNU_LIBPTHREAD_VERSION I'm not sure if this is new information, but I didn't see it mentioned anywhere. Kind regards, -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- �Any errors in spelling, tact or fact are transmission errors�