title: makefile missing separator
body: <p>I have a  makefile (provided by third party) which gives the following error</p>
  
  <pre><code>Makefile:108: *** missing separator.  Stop.
  </code></pre>
  
  <p>The line in question is the following if statement....  any ideas? have tried various replacing tabs with spaces and not got very far at all...</p>
  
  <pre><code>if have_sdl
          libiulib_a_SOURCES += $(srcdir)/utils/dgraphics.cc
          libiulib_a_SOURCES += $(srcdir)/utils/SDL_lines.cc
          include_HEADERS += $(srcdir)/utils/SDL_lines.h
  else
          libiulib_a_SOURCES += $(srcdir)/utils/dgraphics_nosdl.cc
  endif
  </code></pre>