+ * configure.ac: Add description to PATH_SEPARATOR and
+ PATH_SEPARATOR_STR definitions.
+ * acconfig.h: Remove. Silences autoheader warning.
+
+ * configure.ac (AC_INIT): Quote arguments.
+ (AC_PREREQ): Bump required autoconf version to 2.61.
+ (AM_CONFIG_HEADER): Change to AC_CONFIG_HEADERS, quote arguments.
+ (AC_STDC_HEADERS): Change to AC_HEADER_STDC, quote arguments.
+ (AC_HAVE_HEADERS): Change to AC_CHECK_HEADERS, quote arguments.
+ Result of running autoupdate.
+ Also tidy order of macros.
+