[SR-Dev] implicit declaration of function ??syscall???=

i tried to move presence modules to modules directory, but got this kind of error message a few times: gcc -fPIC -DPIC -g -O9 -funroll-loops -Wcast-align -minline-all-stringops -falign-loops -ftree-vectorize -mtune=athlon64 -Wall -DNAME='"ser"' -DVERSION='"2.1.0-dev23-make"' -DARCH='"i386"' -DOS='linux_' -DOS_QUOTED='"linux"' -DCOMPILER='"gcc 4.3.2"' -D__CPU_i386 -D__OS_linux -DSER_VER=2001000 -DCFG_DIR='"/usr/local/etc/ser/"' -DPKG_MALLOC -DSHM_MEM -DSHM_MMAP -DDNS_IP_HACK -DUSE_IPV6 -DUSE_MCAST -DUSE_TCP -DDISABLE_NAGLE -DHAVE_RESOLV_RES -DUSE_DNS_CACHE -DUSE_DNS_FAILOVER -DUSE_DST_BLACKLIST -DUSE_NAPTR -DDBG_QM_MALLOC -DUSE_TLS -DTLS_HOOKS -DFAST_LOCK -DADAPTIVE_WAIT -DADAPTIVE_WAIT_LOOPS=1024 -DCC_GCC_LIKE_ASM -DHAVE_GETHOSTBYNAME2 -DHAVE_UNION_SEMUN -DHAVE_SCHED_YIELD -DHAVE_MSG_NOSIGNAL -DHAVE_MSGHDR_MSG_CONTROL -DHAVE_ALLOCA_H -DHAVE_TIMEGM -DHAVE_SCHED_SETSCHEDULER -DHAVE_EPOLL -DHAVE_SIGIO_RT -DSIGINFO64_WORKARROUND -DUSE_FUTEX -DHAVE_SELECT -DUSE_SCTP -I/usr/include/libxml2 -I/usr/local/include/libxml2 -I/usr/local/include -DOPENSER_MOD_INTERFACE -DMOD_NAME='"presence_dialoginfo"' -c pidf.c -o pidf.o In file included from ../../parser/../mem/../lock_ops.h:85, from ../../parser/../mem/shm_mem.h:76, from ../../parser/../ut.h:67, from ../../parser/../ip_addr.h:49, from ../../parser/msg_parser.h:57, from ../../sr_module.h:63, from pidf.c:54: ../../parser/../mem/../futexlock.h: In function ??futex_get??: ../../parser/../mem/../futexlock.h:94: warning: implicit declaration of function ??syscall?? any idea how to make the declaration explicit? -- juha