Problemas instalando Pgpool

Llevo días tratando de instalar pgpool y no doy con ello. Desde el mismo momento en que le doy ./configure me da el error. Estos son los datos de mi PC

SO: Ubuntu 10.4
Postgres: 9.0.1 Instalado en la carpeta /usr/local/pgsql
Pgpool: pgpool-II-3.1.0-alpha1

En la pc no tenga nadamás instalado que no sea el Postgres 9.0.1 y los programas que se instalan por defecto, a lo mejor es que tengo que instalar algo más o es que estoy ejecutando mal el ./configure. No se porque no coge las librerías libpq si están ahí en la carpeta de la instalación, así como el pg_config. Agradecería mucho que alguien que lo halla instalado me ayude.

lo ejecuto así:
--------------
postgres(at)server02:~/pgpool-II-3.1.0-alpha1$ ./configure
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking for ranlib... ranlib
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking for /usr/bin/ld option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for ar... ar
checking for strip... strip
checking for ranlib... (cached) ranlib
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fPIC -DPIC
checking if gcc PIC flag -fPIC -DPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for flex... no
checking for lex... no
checking for bison... no
checking for byacc... no
checking for -Wall option... yes
checking for -Wmissing-prototypes option... yes
checking for -Wmissing-declarations option... yes
checking for main in -lm... yes
checking for main in -lnsl... yes
checking for main in -lsocket... no
checking for main in -lipc... no
checking for main in -lIPC... no
checking for main in -llc... no
checking for main in -lcompat... no
checking for main in -lBSD... no
checking for main in -lgen... no
checking for main in -lPW... no
checking for main in -lresolv... yes
checking for main in -lcrypt... yes
checking for ANSI C header files... (cached) yes
checking for sys/wait.h that is POSIX.1 compatible... yes
checking fcntl.h usability... yes
checking fcntl.h presence... yes
checking for fcntl.h... yes
checking for unistd.h... (cached) yes
checking getopt.h usability... yes
checking getopt.h presence... yes
checking for getopt.h... yes
checking netinet/tcp.h usability... yes
checking netinet/tcp.h presence... yes
checking for netinet/tcp.h... yes
checking netinet/in.h usability... yes
checking netinet/in.h presence... yes
checking for netinet/in.h... yes
checking netdb.h usability... yes
checking netdb.h presence... yes
checking for netdb.h... yes
checking sys/param.h usability... yes
checking sys/param.h presence... yes
checking for sys/param.h... yes
checking for sys/types.h... (cached) yes
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking sys/un.h usability... yes
checking sys/un.h presence... yes
checking for sys/un.h... yes
checking sys/time.h usability... yes
checking sys/time.h presence... yes
checking for sys/time.h... yes
checking sys/sem.h usability... yes
checking sys/sem.h presence... yes
checking for sys/sem.h... yes
checking sys/shm.h usability... yes
checking sys/shm.h presence... yes
checking for sys/shm.h... yes
checking sys/select.h usability... yes
checking sys/select.h presence... yes
checking for sys/select.h... yes
checking crypt.h usability... yes
checking crypt.h presence... yes
checking for crypt.h... yes
checking sys/pstat.h usability... no
checking sys/pstat.h presence... no
checking for sys/pstat.h... no
checking for an ANSI C-conforming const... yes
checking for pid_t... yes
checking whether time.h and sys/time.h may both be included... yes
checking whether long int is 64 bits... no
checking whether long long int is 64 bits... yes
checking snprintf format for long long int... %lld
checking size of unsigned long... 4
checking size of void *... 4
checking size of size_t... 4
checking whether to build with float4 passed by value... yes
checking whether to build with float8 passed by value... no
checking for struct sockaddr_storage... yes
checking for struct sockaddr_storage.ss_family... yes
checking for struct sockaddr_storage.__ss_family... no
checking for struct sockaddr_storage.ss_len... no
checking for struct sockaddr_storage.__ss_len... no
checking for struct sockaddr.sa_len... no
checking for union semun... no
checking return type of signal handlers... void
checking for vprintf... yes
checking for _doprnt... no
checking for wait3 that fills in rusage... yes
checking types of arguments for accept()... int, int, struct sockaddr *, size_t *
checking for setsid... yes
checking for select... yes
checking for socket... yes
checking for sigprocmask... yes
checking for strdup... yes
checking for strerror... yes
checking for strftime... yes
checking for strtok... yes
checking for asprintf... yes
checking for gai_strerror... yes
checking for hstrerror... yes
checking for pstat... no
checking for setproctitle... no
checking for pg_config... no
checking for PQexecPrepared in -lpq... no
configure: error: libpq is not installed or libpq is old

--
Saludos Felix Noel