compile error when upgrading from 5.1.4.2 to 5.4.2.1 with gcc 2.96

My snmp program can compile ok with net-snmp-5.1.4.2.
I want to use the newer (upgrade to) net-snmp 5.2.5.1, 5.3.2.3 or  5.4.2.1 and all three versions have the same compile errors.
$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)
I have to use this old gcc compiler because I still need to support the old RedHat OS.
I do not understand why 
How to fix the compile error?

My 5.1.4.2 makefile is:
all:	clean
	tar -xzf net-snmp-5.1.4.2.tar.gz
	mkdir net-snmp-5.1.4.2/agent/mibgroup/mymibs
	cp mymibs/* net-snmp-5.1.4.2/agent/mibgroup/mymibs
	cd net-snmp-5.1.4.2 ;\
	rm -f config.cache
	cd net-snmp-5.1.4.2 ;\
	./configure --with-libs=/usr/local/lib/libsensors.a --with-defaults --with-openssl=/ --with-mib-modules="mymibs/chrysalisUtsp ucd-snmp/lmSensors" --with-out-mib-modules="agent_mibs utilities"
	cd net-snmp-5.1.4.2 ;\
	make -f Makefile

clean:
	rm -rf net-snmp-5.1.4.2


My 5.4.2.1 makefile is:
all:	clean
	tar -xzf net-snmp-5.4.2.1.tar.gz
	mkdir net-snmp-5.4.2.1/agent/mibgroup/mymibs
	cp mymibs/* net-snmp-5.4.2.1/agent/mibgroup/mymibs
	cd net-snmp-5.4.2.1 ;\
	rm -f config.cache
	cd net-snmp-5.4.2.1 ;\
	./configure --with-libs=/usr/local/lib/libsensors.a --with-defaults --with-openssl=/ --with-mib-modules="mymibs/chrysalisUtsp ucd-snmp/lmSensors" --with-out-mib-modules="agent_mibs utilities"
	cd net-snmp-5.4.2.1 ;\
	make -f Makefile

clean:
	rm -rf net-snmp-5.4.2.1



The working 5.1.4.2 compile output is:
...
/bin/sh ../../libtool  --mode=compile gcc -I../../include -I../../include -I. -I../.. -I. -I./../.. -I./../../snmplib -I./.. -I..   -g -O2 -Dlinux  -c -o mymibs/myprod.lo mymibs/myprod.c
mkdir mymibs/.libs
gcc -I../../include -I../../include -I. -I../.. -I. -I./../.. -I./../../snmplib -I./.. -I.. -g -O2 -Dlinux -c mymibs/myprod.c  -fPIC -DPIC -o mymibs/.libs/myprod.lo
gcc -I../../include -I../../include -I. -I../.. -I. -I./../.. -I./../../snmplib -I./.. -I.. -g -O2 -Dlinux -c mymibs/myprod.c -o mymibs/myprod.o >/dev/null 2>&1
mv -f mymibs/.libs/myprod.lo mymibs/myprod.lo
/bin/sh ../../libtool  --mode=compile gcc -I../../include -I../../include -I. -I../.. -I. -I./../.. -I./../../snmplib -I./.. -I..   -g -O2 -Dlinux  -c -o ucd-snmp/lmSensors.lo ucd-snmp/lmSensors.c
mkdir ucd-snmp/.libs
...

The failed 5.4.2.1 compile output is:
...
/bin/sh ../../libtool  --mode=compile gcc -I../../include -I. -I../../agent -I../../agent/mibgroup -I../../snmplib   -g -O2 -Dlinux=linux  -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm  -I/usr/local/lib/perl5/5.8.3/i686-linux/CORE   -c -o mymibs/myprod.lo mymibs/myprod.c
mkdir mymibs/.libs
 gcc -I../../include -I. -I../../agent -I../../agent/mibgroup -I../../snmplib -g -O2 -Dlinux=linux -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm -I/usr/local/lib/perl5/5.8.3/i686-linux/CORE -c mymibs/myprod.c  -fPIC -DPIC -o mymibs/.libs/myprod.o
mymibs/myprod.c:31:51: ../../../hwapi_dir/source/oamp_shm.h: No such file or directory
make[3]: *** [mymibs/myprod.lo] Error 1





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