Hi, POSIX says: In addition to the type size programming environments above, all implementations support a multi-threaded programming environment that is orthogonal to all the programming environments listed above. The getconf utility can be used to get flags for the threaded environment, as indicated in Table 4-6. and continues by documenting that getconf POSIX_V7_THREADS_CFLAGS getconf POSIX_V7_THREADS_LDFLAGS retrieve the compiler flags and linker flags, respectively, for building multithreaded programs. glibc getconf does not seem to support this. Certainly not urgent, but thought I should report it before I forget. Sincerely, Jonathan (Side note: on amd64, "getconf -v POSIX_V7_LP64_OFF64 POSIX2_VERSION" works but "getconf -v POSIX_V7_ILP32_OFF32 POSIX2_VERSION" produces "getconf: Couldn't execute /usr/lib/getconf/POSIX_V7_ILP32_OFF32: No such file or directory". So something seems awry, though I care even less about it. Please let me know if you would like a report about that.)