-AC_ARG_WITH(mpfr-dir, [ --with-mpfr-dir=PATH this option has been REMOVED],
- AC_MSG_ERROR([The --with-mpfr-dir=PATH option has been removed.
-Use --with-mpfr=PATH or --with-mpfr-include=PATH plus --with-mpfr-lib=PATH]))
-
-AC_ARG_WITH(mpfr, [ --with-mpfr=PATH specify prefix directory for installed MPFR package.
- Equivalent to --with-mpfr-include=PATH/include
- plus --with-mpfr-lib=PATH/lib])
-AC_ARG_WITH(mpfr-include, [ --with-mpfr-include=PATH
- specify directory for installed MPFR include files])
-AC_ARG_WITH(mpfr-lib, [ --with-mpfr-lib=PATH specify directory for the installed MPFR library])
+AC_ARG_WITH(mpfr-dir,
+[AS_HELP_STRING([--with-mpfr-dir=PATH], [this option has been REMOVED])],
+[AC_MSG_ERROR([The --with-mpfr-dir=PATH option has been removed.
+Use --with-mpfr=PATH or --with-mpfr-include=PATH plus --with-mpfr-lib=PATH])])
+
+AC_ARG_WITH(mpfr,
+[AS_HELP_STRING([--with-mpfr=PATH],
+ [specify prefix directory for installed MPFR package.
+ Equivalent to --with-mpfr-include=PATH/include
+ plus --with-mpfr-lib=PATH/lib])])
+AC_ARG_WITH(mpfr-include,
+[AS_HELP_STRING([--with-mpfr-include=PATH],
+ [specify directory for installed MPFR include files])])
+AC_ARG_WITH(mpfr-lib,
+[AS_HELP_STRING([--with-mpfr-lib=PATH],
+ [specify directory for the installed MPFR library])])