PostgreSQL failed to compile

If PostgreSQL failed to compile on your computer or you found a bug that
is likely to be specific to one platform then please fill out this form
and e-mail it to pgsql-ports(at)postgresql(dot)org(dot)

To report any other bug, fill out the form below and e-mail it to
pgsql-bugs(at)postgresql(dot)org(dot)

If you not only found the problem but solved it and generated a patch
then e-mail it to pgsql-patches(at)postgresql(dot)org instead. Please use the
command "diff -c" to generate the patch.

You may also enter a bug report at http://www.postgresql.org/ instead of
e-mail-ing this form.

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Philippe LEFEVRE
Your email address : ph(dot)lefevre(at)wanadoo(dot)fr

System Configuration
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Architecture (example: Intel Pentium) : Pentium 100

Operating System (example: Linux 2.0.26 ELF) : RedHat 5.1 kernel
2.0.34

PostgreSQL version (example: PostgreSQL-6.4) : PostgreSQL-6.4

Compiler used (example: gcc 2.8.0) : gcc 2.7.2.3-11
: egcs 1.0.2-8
: egcs-c++ 1.0.2-8

Please enter a FULL description of your problem:
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1) doing: ./configure --prefix=/u/postgres/pgsql --with-tcl --with-odbc
--enable-locale is OK

2) doing: make all I've got the following

gmake[2]: Entering directory
`/usr/src/postgresql-v6.4/src/interfaces/libpq++'
c++ -I../../backend -I../../include -I../../interfaces/libpq
-I../../include -I
../../backend -O2 -Wall -Wmissing-prototypes -fpic -c pgenv.cc -o
pgenv.o
In file included from pgenv.cc:23:
pgenv.h:21: string: Aucun fichier ou répertoire de ce type.
gmake[2]: *** [pgenv.o] Error 1

PS: "Aucun fichier ou répertoire de ce type" means no such file or
directory

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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Second step of an install from scratch.

If you know how this problem might be fixed, list the solution below:
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Sorry it seems that a file is missing !

Thanks for your help !