I'm not able to install PostgreSQL

I'm trying to install PostgreSQL 7.0.2 in Solaris 8 Intel platform, but I'm
getting the following messages when I run gmake:

gmake[2]: Leaving directory
`/export/home/zfbf/lixo2/postgresql-7.0.2/src/backend/executor'
gmake -C lib all
gmake[2]: Entering directory
`/export/home/zfbf/lixo2/postgresql-7.0.2/src/backend/lib'
gcc -I../../include -I../../backend -Wall -Wmissing-prototypes
-Wmissing-declarations -I.. -c -o bit.o bit.c
gcc -I../../include -I../../backend -Wall -Wmissing-prototypes
-Wmissing-declarations -I.. -c -o fstack.o fstack.c
gcc -I../../include -I../../backend -Wall -Wmissing-prototypes
-Wmissing-declarations -I.. -c -o hasht.o hasht.c
gcc -I../../include -I../../backend -Wall -Wmissing-prototypes
-Wmissing-declarations -I.. -c -o lispsort.o lispsort.c
gcc -I../../include -I../../backend -Wall -Wmissing-prototypes
-Wmissing-declarations -I.. -c -o stringinfo.o stringinfo.c
stringinfo.c: In function `appendStringInfo':
stringinfo.c:104: `va_list' undeclared (first use in this function)
stringinfo.c:104: (Each undeclared identifier is reported only once
stringinfo.c:104: for each function it appears in.)
stringinfo.c:104: parse error before `args'
stringinfo.c:121: warning: implicit declaration of function `va_start'
stringinfo.c:121: `args' undeclared (first use in this function)
stringinfo.c:124: warning: implicit declaration of function `va_end'
gmake[2]: *** [stringinfo.o] Error 1
gmake[2]: Leaving directory
`/export/home/zfbf/lixo2/postgresql-7.0.2/src/backend/lib'
gmake[1]: *** [lib.dir] Error 2
gmake[1]: Leaving directory
`/export/home/zfbf/lixo2/postgresql-7.0.2/src/backend'
gmake: *** [all] Error 2

What should I do?

sincerely,

Zenon Farias Braga F.

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