(The autoconf manual says this is portable.)
2012-07-30 Glenn Morris <rgm@gnu.org>
+ * configure.ac (opsysfile): Tweak message for null case.
+
* configure.ac (opsysfile): Set to empty on freebsd, gnu-linux,
gnu-kfreebsd; and to usg5-4-common.h on sol2*, unixware.
Configured for \`${canonical}'.
Where should the build process find the source code? ${srcdir}
- What operating system file should Emacs use? ${opsysfile-none}
+ What operating system file should Emacs use? ${opsysfile:-none}
What compiler should emacs be built with? ${CC} ${CFLAGS}
Should Emacs use the GNU version of malloc? ${GNU_MALLOC}${GNU_MALLOC_reason}
Should Emacs use a relocating allocator for buffers? ${REL_ALLOC}