OpenSSH 5.9p1 compilation via gcc and cc - both produce "present but cannot be compiled" warnings -- AIX 6.1 TL7 SP3

[Val Baranov]

configure: WARNING: fcntl.h: present but cannot be compiled
configure: WARNING: fcntl.h:     check for missing prerequisite headers?
configure: WARNING: fcntl.h: see the Autoconf documentation
configure: WARNING: fcntl.h:     section "Present But Cannot Be Compiled"
configure: WARNING: fcntl.h: proceeding with the compiler's result
configure: WARNING:     ## ------------------------------------------- ##
configure: WARNING:     ## Report this to openssh-unix-dev at mindrot.org ##
configure: WARNING:     ## ------------------------------------------- ##

configure: WARNING: sys/audit.h: present but cannot be compiled
configure: WARNING: sys/audit.h:     check for missing prerequisite headers?
configure: WARNING: sys/audit.h: see the Autoconf documentation
configure: WARNING: sys/audit.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sys/audit.h: proceeding with the compiler's result
configure: WARNING:     ## ------------------------------------------- ##
configure: WARNING:     ## Report this to openssh-unix-dev at mindrot.org ##
configure: WARNING:     ## ------------------------------------------- ##

configure: WARNING: sys/stream.h: present but cannot be compiled
configure: WARNING: sys/stream.h:     check for missing prerequisite headers?
configure: WARNING: sys/stream.h: see the Autoconf documentation
configure: WARNING: sys/stream.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sys/stream.h: proceeding with the compiler's result
configure: WARNING:     ## ------------------------------------------- ##
configure: WARNING:     ## Report this to openssh-unix-dev at mindrot.org ##
configure: WARNING:     ## ------------------------------------------- ##

checking zlib.h usability... no
checking zlib.h presence... yes configure: WARNING: zlib.h: present but cannot be compiled
configure: WARNING: zlib.h:     check for missing prerequisite headers?
configure: WARNING: zlib.h: see the Autoconf documentation
configure: WARNING: zlib.h:     section "Present But Cannot Be Compiled"
configure: WARNING: zlib.h: proceeding with the compiler's result
configure: WARNING:     ## ------------------------------------------- ##
configure: WARNING:     ## Report this to openssh-unix-dev at mindrot.org ##
configure: WARNING:     ## ------------------------------------------- ##