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AX_WITH_PYTHON([minimum-version], [value-if-not-found], [path])
0.5.57 : djmitche
Dustin Mitchell <dustin@cs.uchicago.edu>
Locates an installed Python binary, placing the result in the precious variable $PYTHON. Accepts a present $PYTHON, then --with-python, and failing that searches for python in the given path (which defaults to the system path). If python is found, $PYTHON is set to the full path of the binary; if it is not found, $PYTHON is set to VALUE-IF-NOT-FOUND, which defaults to 'python'.
Example:
AX_WITH_PYTHON(2.2, missing)
AC_DEFUN([AX_WITH_PYTHON],
[
AC_ARG_VAR([PYTHON])
dnl unless PYTHON was supplied to us (as a precious variable)
if test -z "$PYTHON"
then
AC_MSG_CHECKING(for --with-python)
AC_ARG_WITH(python,
AC_HELP_STRING([--with-python=PYTHON],
[absolute path name of Python executable]),
[ if test "$withval" != "yes"
then
PYTHON="$withval"
AC_MSG_RESULT($withval)
else
AC_MSG_RESULT(no)
fi
],
[ AC_MSG_RESULT(no)
])
fi
dnl if it's still not found, check the paths, or use the fallback
if test -z "$PYTHON"
then
AC_PATH_PROG([PYTHON], python, m4_ifval([$2],[$2],[python]), $3)
fi
dnl check version if required
m4_ifvaln([$1], [
dnl do this only if we didn't fall back
if test "$PYTHON" != "m4_ifval([$2],[$2],[python])"
then
AC_MSG_CHECKING($PYTHON version >= $1)
if test `$PYTHON -c ["import sys; print sys.version[:3] >= \"$1\" and \"OK\" or \"OLD\""]` = "OK"
then
AC_MSG_RESULT(ok)
else
AC_MSG_RESULT(no)
PYTHON="$2"
fi
fi])
])