Improve compatibility with older dependencies

Due to our meson.add_install_script() usage, which results in a warning,
followed by an error.

fiv-io-model.c

@@ -166,6 +166,10 @@ model_entry_array_new(void)
 		(GDestroyNotify) fiv_io_model_entry_unref);
 }
 
+#if !GLIB_CHECK_VERSION(2, 70, 0)
+#define g_pattern_spec_match g_pattern_match
+#endif
+
 static gboolean
 model_supports(FivIoModel *self, const char *filename)
 {

fiv-thumbnail.c

@@ -286,7 +286,8 @@ extract_libraw_unpack(libraw_data_t *iprc, int *flip, GError **error)
 	// because decoding a thumbnail will always be /much/ quicker than a render.
 	// TODO(p): Maybe don't mark raw image thumbnails as low-quality
 	// if they're the right aspect ratio, and of sufficiently large size.
-	// And I still worry about tflip.
+	// The only downsides to camera-provided thumbnails seem to be cropping,
+	// and when they're decoded incorrectly. Also don't trust tflip.
 	float output_pixels = (float) iprc->sizes.iwidth * iprc->sizes.iheight;
 	// Note that the ratio may even be larger than 1, as seen with CR2 files.
 	while (i < count &&
@@ -363,7 +364,6 @@ extract_libraw_unpack(libraw_data_t *iprc, int *flip, GError **error)
 	// The main image's "flip" often matches up, but sometimes doesn't, e.g.:
 	//  - Phase One/H 25/H25_Outdoor_.IIQ
 	//  - Phase One/H 25/H25_IT8.7-2_Card.TIF
-	//  - Leaf/Aptus 22/L_003172.mos (JPEG)
 	*flip = iprc->sizes.flip
 	return TRUE;
 }
@@ -457,7 +457,8 @@ extract_libraw(GFile *target, GMappedFile *mf, GError **error)
 	//  - Samsung/NX200/2013-05-08-194524__sam6589.srw
 	//  - Sony/DSC-HX95/DSC00018.ARW
 	// Note that LibRaw inserts its own Exif segment if it doesn't find one,
-	// and this may differ from flip.
+	// and this may differ from flip. It may also be wrong, as in:
+	//  - Leaf/Aptus 22/L_003172.mos
 	//
 	// Some files are problematic and we won't bother with special-casing:
 	//  - Nokia/Lumia 1020/RAW_NOKIA_LUMIA_1020.DNG (bitmap) has wrong color.

fiv.c

@@ -1352,7 +1352,7 @@ show_preferences(void)
 	if (!g_spawn_async(
 		NULL, argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, &error)) {
 		if (g_error_matches(error, G_SPAWN_ERROR, G_SPAWN_ERROR_NOENT))
-			g_prefix_error_literal(&error,
+			g_prefix_error(&error, "%s",
 				"Please install dconf-editor, or use the gsettings utility.\n");
 		show_error_dialog(error);
 	}

meson.build

@@ -1,7 +1,8 @@
 # vim: noet ts=4 sts=4 sw=4:
 project('fiv', 'c',
 	default_options : ['c_std=gnu99', 'warning_level=2'],
-	version : '0.1.0')
+	version : '0.1.0',
+	meson_version : '>=0.57')
 
 cc = meson.get_compiler('c')
 add_project_arguments(
@@ -153,7 +154,8 @@ gresources = gnome.compile_resources('resources',
 tiff_tables = custom_target('tiff-tables.h',
 	output : 'tiff-tables.h',
 	input : 'tiff-tables.db',
-	command : ['tiff-tables.awk', '@INPUT@'],
+	# Meson 0.56 chokes on files() as well as on a relative path.
+	command : [meson.current_source_dir() / 'tiff-tables.awk', '@INPUT@'],
 	capture : true,
 )