[mod_python] configure breaks with bash-3.1.14(1)-release

Hi,
   configure breaks for me on Gentoo linux with this error. I 
suspect it is bash-specific bug. Has anyone seen this?

checking Python version... 2.4
checking Python install prefix... /usr
checking checking where python libraries are installed... 
/usr/lib/python2.4
checking for Py_NewInterpreter in -lpython2.4... yes
checking what libraries Python was linked with... -lpython2.4 
-lpthread -ldl  -lutil   -lm
checking linker flags used to link Python...
checking where Python include files are... -I/usr/include/python2.4
./configure: line 3427: syntax error near unexpected token `('
./configure: line 3427: `  as_lineno_3=`(expr $as_lineno_1 + 1) 
2>/dev/null`'