Help compiling postgres

Hi all

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

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

It is a modified version of Postgres to accept replication. Can anyone help me?

Thanks to all

J.M. Milan