<p></p>
<p>Heads up: <code>lexlib</code> was moved into the <code>lexilla</code> source tree, so that last include statement does nothing.</p>
<p>Try including <code>scintilla/src</code> instead:</p>
<div class="highlight highlight-source-diff"><pre><span class="pl-c1">diff --git a/scintilla/Makefile.am b/scintilla/Makefile.am</span>
index 4fe3851c0..543b7a4d6 100644
<span class="pl-md">--- a/scintilla/Makefile.am</span>
<span class="pl-mi1">+++ b/scintilla/Makefile.am</span>
<span class="pl-mdr">@@ -175,7 +175,7 @@</span> liblexilla_la_CPPFLAGS += -I$(srcdir)/lexilla/include -I$(srcdir)/lexilla/lexlib
 liblexilla_la_SOURCES = $(LEXLIB_SRCS) $(LEXER_SRCS)
 
 libscintilla_la_CPPFLAGS = $(AM_CPPFLAGS)
<span class="pl-md"><span class="pl-md">-</span>libscintilla_la_CPPFLAGS += -I$(top_srcdir) -I$(srcdir)/include -I$(srcdir)/lexlib </span>
<span class="pl-mi1"><span class="pl-mi1">+</span>libscintilla_la_CPPFLAGS += -I$(top_srcdir) -I$(srcdir)/include -I$(srcdir)/src</span>
 libscintilla_la_SOURCES = $(SRCS)
 
 marshallers: gtk/scintilla-marshal.list</pre></div>
<p>That might resolve your <a href="https://app.travis-ci.com/github/geany/geany/jobs/532735207#L1222" rel="nofollow">header resolution problem</a>:</p>
<pre><code>make[2]: Leaving directory '/home/travis/build/geany/geany/_build/ctags'
Making all in scintilla
make[2]: Entering directory '/home/travis/build/geany/geany/_build/scintilla'
  CXX      gtk/libscintilla_la-PlatGTK.lo
  CXX      gtk/libscintilla_la-ScintillaGTK.lo
../../scintilla/gtk/PlatGTK.cxx:30:10: fatal error: Debugging.h: No such file or directory
 #include "Debugging.h"
          ^~~~~~~~~~~~~
</code></pre>

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