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:
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# ./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