CVS snap. compile halts giving `TCP_NODELAY' undeclared (Linux i386 RH6.1)

Hi all,
I'm trying to compile the CVS snapshot (to start playing
with TOAST)

I've just checked out the current release, but while
I'm trying to compile, I take the following:

make[3]: Entering directory `/home/zanzi/temp/pgsql/src/backend/libpq'
gcc -c -I../../../src/include -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations be-fsstubs.c -o be-fsstubs.o
gcc -c -I../../../src/include -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations pqcomm.c -o pqcomm.o
pqcomm.c: In function `StreamConnection':
pqcomm.c:346: `TCP_NODELAY' undeclared (first use in this function)
pqcomm.c:346: (Each undeclared identifier is reported only once
pqcomm.c:346: for each function it appears in.)
make[3]: *** [pqcomm.o] Error 1
make[3]: Leaving directory `/home/zanzi/temp/pgsql/src/backend/libpq'
make[2]: *** [libpq-recursive] Error 2
make[2]: Leaving directory `/home/zanzi/temp/pgsql/src/backend'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/zanzi/temp/pgsql/src'
make: *** [all] Error 2

I'm using a Linux RedHat 6.1 box.
Has anyone already find this problem ???
Where can I declare TCP_NODELAY (and how) ???

Any help will be highly appreciated.
Thanks.
/gp

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