The == operator is not in POSIX.
# We also need to find the name of the python3 executable (for 'make install').
# Some OSes call this python3, some call it python3.2, etc. etc.
AC_CHECK_PROGS([PYTHON3], [python3.4 python3.3 python3.2 python3])
# We also need to find the name of the python3 executable (for 'make install').
# Some OSes call this python3, some call it python3.2, etc. etc.
AC_CHECK_PROGS([PYTHON3], [python3.4 python3.3 python3.2 python3])
-if test "x$PYTHON3" == "x"; then
+if test "x$PYTHON3" = "x"; then
AC_MSG_ERROR([cannot find python3 executable.])
fi
AC_MSG_ERROR([cannot find python3 executable.])
fi