8.0.0beta1: -lpthread missing

System Configuration
---------------------  Architecture (example: Intel Pentium)         : Intel Pentium
  Operating System (example: Linux 2.4.18)      : Linux 2.4.21-grsec
(Debian)
  PostgreSQL version (example: PostgreSQL-8.0):   PostgreSQL-8.0.0-beta1
  Compiler used (example:  gcc 2.95.2)          : 2.95.4


Please enter a FULL description of your problem:
------------------------------------------------
When configuring --enable-thread-safety the binaries cannot be linked:
gcc -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations initdb.o dirmod.o exe
c.o -L../../../src/interfaces/libpq -lpq -L../../../src/port
-Wl,-rpath,/opt/postgresql-800beta1/li
b -lpgport -lz -lreadline -lcrypt -lresolv -lnsl -ldl -lm  -o initdb
../../../src/interfaces/libpq/libpq.so: undefined reference to
`pthread_getspecific'
../../../src/interfaces/libpq/libpq.so: undefined reference to
`pthread_once'
../../../src/interfaces/libpq/libpq.so: undefined reference to
`pthread_key_create'
../../../src/interfaces/libpq/libpq.so: undefined reference to
`pthread_setspecific'
collect2: ld returned 1 exit status



Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
----------------------------------------------------------------------
# ./configure --prefix=/opt/postgresql-800beta1 --enable-thread-safety
# make


If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------
The binaries must be linked with pthread (-lpthread).


Regards, Martin