Allow compiling without nautilus/nautilus-extension.h

Some old distributions like CentOS 7 can build eiciel
but still use an old nautilus extensions headers layout.

Author: rofirrim

configure.ac

@@ -193,6 +193,15 @@ AC_CHECK_LIB(acl, acl_get_perm,
    AC_SUBST(ACL_LIBS, [-lacl])
  ],)
 
+# This must be easier, right?
+OLDCXXFLAGS="$CXXFLAGS"
+OLDCPPFLAGS="$CPPFLAGS"
+CXXFLAGS="$CXXFLAGS ${GTKMM_CFLAGS} ${NAUTILUS_EXTENSION_CFLAGS}"
+CPPFLAGS="$CXXFLAGS ${GTKMM_CFLAGS} ${NAUTILUS_EXTENSION_CFLAGS}"
+AC_CHECK_HEADERS([nautilus/nautilus-extension.h], [], [], [])
+CXXFLAGS="$OLDCXXFLAGS"
+CPPFLAGS="$OLDCPPFLAGS"
+
 dnl Output files
 AC_CONFIG_FILES([Makefile
 		src/Makefile

meson.build

@@ -2,7 +2,8 @@
 project('eiciel', 'cpp',
   version : '0.9.13',
   meson_version : '>=0.54',
-  license: 'GPL2+')
+  license: 'GPL2+',
+  default_options: ['cpp_std=c++11'])
 
 package_name = 'eiciel'
 email = 'rofirrim@gmail.com'
@@ -49,6 +50,10 @@ has_acl_get_perm_np = compiler.has_function('acl_get_perm_np',
                                             dependencies: libacl)
 conf_data.set('HAVE_ACL_GET_PERM_NP', has_acl_get_perm_np)
 
+has_nautilus_extension_h = compiler.has_header('nautilus/nautilus-extension.h',
+         dependencies: [libnautilus_extensions3, gtkmm3])
+conf_data.set('HAVE_NAUTILUS_NAUTILUS_EXTENSION_H', has_nautilus_extension_h)
+
 # Internationalization
 i18n = import('i18n')
 subdir('po')

src/eiciel_nautilus_page.cpp

@@ -22,8 +22,14 @@
 #include <glib/gi18n-lib.h>
 #include <gtk/gtk.h>
 #include <gtkmm.h>
+
 extern "C" {
+#ifdef HAVE_NAUTILUS_NAUTILUS_EXTENSION_H
 #include <nautilus-extension.h>
+#else
+#include <libnautilus-extension/nautilus-property-page-provider.h>
+#include <libnautilus-extension/nautilus-property-page.h>
+#endif
 }
 
 #include "eiciel_main_window.hpp"