Hello, When compiling the glibc on ppc64 (Power5) (SLES9 or SLES10), TLS (Thread-Local Storage) support is not available. (See details below). Can you help understanding the problem ? Thanks, Tony When being in the directory where are the source code of the glibc. Example here below: 2.4 (Same problem with 2.3.4 and 2.3.6 .) $ ./configure --enable-add-ons=nptl --with-tls --with-__thread .... checking for powerpc64 TLS support... no .... $ make .... #error "TLS support is required." Test for TLS support is done by the sysdeps/powerpc/powerpc64/elf/configure script of the glibc. $ cat config.log .... configure:7: checking for powerpc64 TLS support configure:52: gcc -c -g -O2 conftest.s 1>&5 conftest.s: Assembler messages: conftest.s:18: Error: syntax error; found `@' but expected `,' conftest.s:18: Error: junk at end of line: `@toc' conftest.s:24: Error: syntax error; found `@' but expected `,' conftest.s:24: Error: junk at end of line: `@toc' conftest.s:33: Error: syntax error; found `@' but expected `(' conftest.s:33: Error: junk at end of line: `@toc(2)' configure:55: $? = 1 configure:63: result: no ....