Disable Python interface by default

configure.ac

@@ -72,14 +72,12 @@ AM_CONDITIONAL([ENABLE_FORTRAN_HL], [test x"$enable_fortran_hl" = xyes])
 
 AC_ARG_ENABLE([python],
   [AS_HELP_STRING([--enable-python],
-     [enable the Python interface @<:@default=auto@:>@])], [],
-  [enable_python=auto])
-AS_IF([test "x$enable_shared" = xno || test "x$with_pic" = xno],
-  [AS_CASE([$enable_python],
-     [auto], [enable_python=no],
-     [no], [],
-     [AC_MSG_ERROR([cannot provide the Python interface when the shared libraries dnl
-or PIC objects are disabled])])])
+     [enable the Python interface @<:@default=no@:>@])], [],
+  [enable_python=no])
+AS_VAR_IF([enable_python], [yes],
+  [AS_IF([test "x$enable_shared" = xno || test "x$with_pic" = xno],
+     [AC_MSG_ERROR([cannot provide the Python interface when the shared libraries or dnl
+PIC objects are disabled])])])
 
 AC_ARG_ENABLE([check],
   [AS_HELP_STRING([--enable-check],
@@ -112,7 +110,7 @@ AS_VAR_IF([enable_check], [yes],
   [CHECK_CLIBS=;CHECK_CFLAGS=])
 AM_CONDITIONAL([ENABLE_CHECK], [test x"$enable_check" = xyes])
 
-AS_IF([test x"$enable_python" != xno],
+AS_VAR_IF([enable_python], [yes],
   [dnl
 dnl AM_PATH_PYTHON does not run ACTION-IF-NOT-FOUND when the PYTHON provided by the user
 dnl is too old:
@@ -125,11 +123,8 @@ dnl is too old:
       PACKAGE=mtime
       AM_PATH_PYTHON([mtime_python_min_version], [mtime_python_found=yes], [:])
       PACKAGE=$save_PACKAGE])
-   AS_VAR_IF([mtime_python_found], [yes],
-     [enable_python=yes],
-     [AS_VAR_IF([enable_python], [auto],
-        [enable_python=no],
-        [AC_MSG_FAILURE([cannot find suitable Python interpreter])])])])
+   AS_VAR_IF([mtime_python_found], [no],
+     [AC_MSG_FAILURE([cannot find suitable Python interpreter])])])
 AM_CONDITIONAL([ENABLE_PYTHON], [test x"$enable_python" = xyes])
 
 AM_MISSING_PROG([RAGEL], [ragel])