Hi all, I still can not compile PJSIP under redhat ES 5.1 (64bit). Is there someone working on 64-bit OS with PJSIP? I give the steps below, Step 1: [root at www 2.1]# ./configure --disable-sound --libdir=/usr/lib64 --host=x86_64-redhat-linux LDFLAGS="-L../lib" CFLAGS="-fno-PIC" [Sam] I traced the log, there is no error. Step 2: [root at www 2.1]# make dep >depend.log& [Sam] I also traced the log, no problem. Step 3: [root at www 2.1]# make ../lib/libpj-x86_64-redhat-linux-gnu.a: could not read symbols: Archive has no index; run ranlib to add one [Sam] I read supported targets(http://www.pjsip.org/using.htm), can not find x86_64. Thanks, Sam