Add a macro to label a group of options.

build/autoconf/altoptions.m4

@@ -29,6 +29,7 @@ dnl MOZ_ARG_ENABLE_BOOL_OR_STRING( NAME, HELP, IF-YES, IF-NO, IF-SET[, ELSE]]])
 dnl MOZ_ARG_WITH_BOOL(             NAME, HELP, IF-YES [, IF-NO [, ELSE])
 dnl MOZ_ARG_WITHOUT_BOOL(          NAME, HELP, IF-NO [, IF-YES [, ELSE])
 dnl MOZ_ARG_WITH_STRING(           NAME, HELP, IF-SET [, ELSE])
+dnl MOZ_ARG_HEADER(Comment)
 dnl MOZ_READ_MYCONFIG() - Read in 'myconfig.sh' file
 
 
@@ -86,7 +87,9 @@ dnl MOZ_ARG_WITH_STRING(NAME, HELP, IF-SET [, ELSE])
 AC_DEFUN(MOZ_ARG_WITH_STRING,
 [AC_ARG_WITH([$1], [$2], [$3], [$4])])
 
-
+dnl MOZ_ARG_HEADER(Comment)
+dnl This is used by webconfig to group options
+define(MOZ_ARG_HEADER, [# $1])
 
 dnl MOZ_READ_MYCONFIG() - Read in 'myconfig.sh' file
 AC_DEFUN(MOZ_READ_MYCONFIG,