pyconfigure

fix typo

diff --git a/m4/python.m4 b/m4/python.m4
--- a/m4/python.m4
+++ b/m4/python.m4
@@ -459,7 +459,7 @@ else:
      case $pc_cv_python_exec_dir in
      $pc_py_exec_prefix*)
        pc__strip_prefix=`echo "$pc_py_exec_prefix" | sed 's|.|.|g'`
-       pc_cv_python_pyexecdir=`echo "$pc_cv_python_exec_dir" | sed "s,^$pc__strip_prefix,$PYTHON_EXEC_PREFIX,"`
+       pc_cv_python_exec_dir=`echo "$pc_cv_python_exec_dir" | sed "s,^$pc__strip_prefix,$PYTHON_EXEC_PREFIX,"`
        ;;
      *)
        case $pc_py_exec_prefix in