Hi All, I am trying to build FS 1.0.4pre8 for Solaris 10 (Update 5), however the build fails with the following error: /bin/bash /export/home/user/packages/BUILD/freeswitch-1.0.4pre8/libs/apr/libtool --silent --mode=compile /usr/bin/cc -g -DHAVE_CONFIG_H -DSOLARIS2=10 -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -D_LARGEFILE64_SOURCE -I./include -I/export/home/user/packages/BUILD/freeswitch-1.0.4pre8/libs/apr/include/arch/unix -I./include/arch/unix -I/export/home/user/packages/BUILD/freeswitch-1.0.4pre8/libs/apr/include -o locks/unix/thread_mutex.lo -c locks/unix/thread_mutex.c && touch locks/unix/thread_mutex.lo "/usr/include/sys/feature_tests.h", line 336: #error: "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications require the use of c99" cc: acomp failed for locks/unix/thread_mutex.c make[2]: *** [locks/unix/thread_mutex.lo] Error 1 make[2]: Leaving directory `/export/home/user/packages/BUILD/freeswitch-1.0.4pre8/libs/apr' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/export/home/user/packages/BUILD/freeswitch-1.0.4pre8/libs/apr' make: *** [libs/apr/libapr-1.la] Error 2 I have the JDS-CBE build environment setup as recommended on the wiki with Sun Studio 12 compiler suite installed as well. I have tried building using Sun's compiler and GNU compiler but I get the same error message. I just recently tried "bootstrap.sh" prior to "configure", "make" but the error is still the same. Would someone have any suggestions for me to try to get around this? Thanks Bruce