configure error with autoconf-2.64

hi there,

it seems there is a problem using autoconf-2.64:

checking assert.h usability... yes
checking assert.h presence... yes
checking for assert.h... yes
checking math.h usability... yes
checking math.h presence... yes
checking for math.h... yes
checking for pthread.h... no
./configure: line 4507: syntax error near unexpected token `else'
./configure: line 4507: `else'

indeed it works fine using autoconf-2.63

cheers,
Acrux
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