Help compiling postgres

I'm trying to compile an old version of Postgres and suddenly I've got
the folloging error message:

This looks to be the working model of postgres-r. Did you get it via CVS
or from
the down load area?

These questions should probably be asked on the pg-replication list
instead of hackes.

make[2]: Cambiando a directorio `/home/jmilan/postgres-r/src/backend/port'
gcc -I../../include -I../../backend -O2 -Wall -Wmissing-prototypes
-I.. -c -o dynloader.o dynloader.c
gcc -I../../include -I../../backend -O2 -Wall -Wmissing-prototypes
-I.. -c -o inet_aton.o inet_aton.c
inet_aton.c:58: warning: no previous prototype for `inet_aton'
gcc -I../../include -I../../backend -O2 -Wall -Wmissing-prototypes
-I.. -c -o isinf.o isinf.c
isinf.c:8:20: ieeefp.h: No existe el fichero o el directorio
make[2]: *** [isinf.o] Error 1
make[2]: Saliendo directorio `/home/jmilan/postgres-r/src/backend/port'
make[1]: *** [port.dir] Error 2
make[1]: Saliendo directorio `/home/jmilan/postgres-r/src/backend'
make: *** [all] Error 2

What OS are you using? I know the "working model" has worked on several
versions
of Red Hat, and Solaris, but I'm not sure it's been tested on many other
OSs.

Darren