Blocked revisions 81669,81672,81683 via svnmerge

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  r81669 | stefan.krah | 2010-06-03 14:39:50 +0200 (Thu, 03 Jun 2010) | 9 lines

  Issue #7384: If the system readline library is linked against ncurses,
  the curses module must be linked against ncurses as well. Otherwise it
  is not safe to load both the readline and curses modules in an application.

  Thanks Thomas Dickey for answering questions about ncurses/ncursesw
  and readline!
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  r81672 | stefan.krah | 2010-06-03 16:25:16 +0200 (Thu, 03 Jun 2010) | 3 lines

  Use compiler rather than compiler_obj. Thanks Michael Foord for noticing.
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  r81683 | stefan.krah | 2010-06-04 11:49:20 +0200 (Fri, 04 Jun 2010) | 1 line

  Detect missing ldd on all systems.
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