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diff --git a/src/suil_config.h b/src/suil_config.h
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+/*
+  Copyright 2021 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*
+  Configuration header that defines reasonable defaults at compile time.
+
+  This allows compile-time configuration from the command line (typically via
+  the build system) while still allowing the source to be built without any
+  configuration.  The build system can define SUIL_NO_DEFAULT_CONFIG to disable
+  defaults, in which case it must define things like HAVE_FEATURE to enable
+  features.  The design here ensures that compiler warnings or
+  include-what-you-use will catch any mistakes.
+
+  Note that suil loads modules at runtime, so the default configuration
+  contains paths which are likely not what you want.
+*/
+
+#ifndef SUIL_CONFIG_H
+#define SUIL_CONFIG_H
+
+// Define version unconditionally so a warning will catch a mismatch
+#define SUIL_VERSION "0.10.9"
+
+#if !defined(SUIL_NO_DEFAULT_CONFIG)
+
+// X11 (requires loading an init module)
+#  ifndef HAVE_X11
+#    ifdef __has_include
+#      if __has_include(<X11/Xlib.h>)
+#        define HAVE_X11
+#      endif
+#    endif
+#  endif
+
+#endif // !defined(SUIL_NO_DEFAULT_CONFIG)
+
+/*
+  Make corresponding USE_FEATURE defines based on the HAVE_FEATURE defines from
+  above or the command line.  The code checks for these using #if (not #ifdef),
+  so there will be an undefined warning if it checks for an unknown feature,
+  and this header is always required by any code that checks for features, even
+  if the build system defines them all.
+*/
+
+#ifdef HAVE_X11
+#  define USE_X11 1
+#else
+#  define USE_X11 0
+#endif
+
+/*
+  Define required values.  These are always used as a fallback, even with
+  LILV_NO_DEFAULT_CONFIG, since they must be defined for the build to work.
+*/
+
+// Directory of loadable wrapper modules
+#ifndef SUIL_MODULE_DIR
+#  ifdef _WIN32
+#    define SUIL_MODULE_DIR "C:\\Program Files\\Common Files\\Suil\\lib"
+#  else
+#    define SUIL_MODULE_DIR "/usr/local/lib/suil-0"
+#  endif
+#endif
+
+// Separator between directories in a path
+#ifndef SUIL_DIR_SEP
+#  define SUIL_DIR_SEP "/"
+#endif
+
+// Prefix for loadable module filenames
+#ifndef SUIL_MODULE_PREFIX
+#  ifdef _WIN32
+#    define SUIL_MODULE_PREFIX ""
+#  else
+#    define SUIL_MODULE_PREFIX "lib"
+#  endif
+#endif
+
+// Extension for loadable module filenames
+#ifndef SUIL_MODULE_EXT
+#  if defined(__APPLE__)
+#    define SUIL_MODULE_EXT ".dylib"
+#  elif defined(_WIN32)
+#    define SUIL_MODULE_EXT ".dll"
+#  else
+#    define SUIL_MODULE_EXT ".so"
+#  endif
+#endif
+
+// Gtk2 library to load when embedding in Qt
+#ifndef SUIL_GTK2_LIB_NAME
+#  define SUIL_GTK2_LIB_NAME "libgtk-x11-2.0.so.0"
+#endif
+
+// Gtk3 library to load when embedding in Qt
+#ifndef SUIL_GTK3_LIB_NAME
+#  define SUIL_GTK3_LIB_NAME "libgtk-x11-3.0.so.0"
+#endif
+
+#endif // SUIL_CONFIG_H