V8 Beta 5 on AIX

I tried compliling v8 beta 5 (grabbed from cvs on Friday) on AIX 5.1.
It fails during the make

make[4]: Entering directory
`/opt/OXRS/Sources/pgsql-HEAD/src/interfaces/libpq'
make[4]: Nothing to be done for `all'.
make[4]: Leaving directory
`/opt/OXRS/Sources/pgsql-HEAD/src/interfaces/libpq'
make[4]: Entering directory `/opt/OXRS/Sources/pgsql-HEAD/src/port'
make[4]: Nothing to be done for `all'.
make[4]: Leaving directory `/opt/OXRS/Sources/pgsql-HEAD/src/port'
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wendif-labels
-fno-strict-aliasing -g pg_ctl.o -L../../../src/interfaces/libpq -lpq
-L../../../src/port -L/opt/OXRS/supporting-packages/readline-4.2/lib
-L/opt/OXRS/supporting-packages/zlib-1.1.4 -lpgport -lz -lreadline
-lcurses -lPW -lld -lnsl -ldl -lm -o pg_ctl
ld: 0711-317 ERROR: Undefined symbol: .pthread_sigmask
ld: 0711-317 ERROR: Undefined symbol: .sigwait
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_lock
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_unlock
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more
information.
collect2: ld returned 8 exit status
make[3]: *** [pg_ctl] Error 1
make[3]: Leaving directory `/opt/OXRS/Sources/pgsql-HEAD/src/bin/pg_ctl'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/opt/OXRS/Sources/pgsql-HEAD/src/bin'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/opt/OXRS/Sources/pgsql-HEAD/src'
make: *** [all] Error 2

Brad.