these should include the correct headers that declare the functions they
are using.
configure:20429: checking for accept4 support
/src/build/apr/apr-1.4.6/config.log:conftest.c:72:9: error: implicit
declaration of function 'strncpy'
configure:22070: checking for inet_addr
/src/build/apr/apr-1.4.6/config.log:conftest.c:100:1: error: implicit
declaration of function 'inet_addr'
configure:22118: checking for inet_network
/src/build/apr/apr-1.4.6/config.log:conftest.c:100:1: error: implicit
declaration of function 'inet_network'
configure:25333: checking for robust cross-process mutex support
/src/build/apr/apr-1.4.6/config.log:conftest.c:193:5: error: implicit
declaration of function 'pthread_mutexattr_setrobust_np'
configure:25805: checking if fcntl returns EACCES when F_SETLK is
already held
/src/build/apr/apr-1.4.6/config.log:conftest.c:213:5: error: implicit
declaration of function 'lockit'
configure:27005: checking if TCP_NODELAY setting is inherited from
listening sockets
/src/build/apr/apr-1.4.6/config.log:conftest.c:228:5: error: implicit
declaration of function 'memset'
configure:27138: checking if O_NONBLOCK setting is inherited from
listening sockets
/src/build/apr/apr-1.4.6/config.log:conftest.c:223:5: error: implicit
declaration of function 'memset'
