net-snmp fails to compile on hp-ux

Hello, I try to configure Net-Snmp v 5.6.1, my system: HP-UX 11.23 U ia64, gcc version 4.2.3:

bash# ./configure --prefix=/opt/snmp --without-rpm
.
.
.
checking sys/sema.h presence... yes
configure: WARNING: sys/sema.h: present but cannot be compiled
configure: WARNING: sys/sema.h:     check for missing prerequisite headers?
configure: WARNING: sys/sema.h: see the Autoconf documentation
configure: WARNING: sys/sema.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sys/sema.h: proceeding with the preprocessor's result
configure: WARNING: sys/sema.h: in the future, the compiler will take precedence
configure: WARNING:     ## ---------------------------------------------------- ##
configure: WARNING:     ## Report this to [email protected] ##
configure: WARNING:     ## ---------------------------------------------------- ##

.
.
.

And finally:

bash# make
        /usr/bin/sed -f sedscript ./EXAMPLE.conf.def > EXAMPLE.conf
making all in /opt/DISTRIB/net-snmp-5.6.1/snmplib
        /bin/sh ../libtool  --mode=compile /usr/local/bin/gcc -I../include -I.  -I../snmplib  -fno-strict-aliasing -g -O2 -Uhpux11 -Dhpux11=hpux11  -c -o system.lo system.c
libtool: compile:  /usr/local/bin/gcc -I../include -I. -I../snmplib -fno-strict-aliasing -g -O2 -Uhpux11 -Dhpux11=hpux11 -c system.c  -fPIC -DPIC -o .libs/system.o
system.c: In function 'get_myaddr':
system.c:454: error: storage size of 'ifc' isn't known
system.c:470: error: invalid application of 'sizeof' to incomplete type 'struct ifreq'
system.c:475: error: invalid application of 'sizeof' to incomplete type 'struct ifreq'
system.c:478: error: invalid application of 'sizeof' to incomplete type 'struct ifconf'
system.c:509: error: increment of pointer to unknown structure
system.c:509: error: arithmetic on pointer to an incomplete type
system.c:512: error: dereferencing pointer to incomplete type
system.c:515: error: dereferencing pointer to incomplete type
system.c:517: error: invalid application of 'sizeof' to incomplete type 'struct ifreq'
system.c:520: error: dereferencing pointer to incomplete type
system.c:520: error: 'IFF_UP' undeclared (first use in this function)
system.c:520: error: (Each undeclared identifier is reported only once
system.c:520: error: for each function it appears in.)
system.c:524: error: dereferencing pointer to incomplete type
system.c:531: error: invalid application of 'sizeof' to incomplete type 'struct ifreq'
system.c:535: error: dereferencing pointer to incomplete type
*** Error exit code 1

Stop.
*** Error exit code 1

Stop.

Do you have any ideas about this error???

---
Best regards, Artur Salikhov

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