--- ghex-46.1/meson.build.orig
+++ ghex-46.1/meson.build
@@ -141,7 +141,6 @@
     'unistd.h',
     'fcntl.h',
     'sys/ioctl.h',
-    'linux/fs.h',
     ]
   foreach h : check_headers_direct
     cc.has_header(h, required: true)
--- ghex-46.1/src/hex-buffer-direct.h.orig
+++ ghex-46.1/src/hex-buffer-direct.h
@@ -33,7 +33,13 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
+#ifdef __linux__
 #include <linux/fs.h>
+#endif
+#ifdef __sun__
+#include <sys/dkio.h>
+#include <sys/vtoc.h>
+#endif
 
 G_BEGIN_DECLS
 
--- ghex-46.1/src/hex-buffer-direct.c.orig
+++ ghex-46.1/src/hex-buffer-direct.c
@@ -412,11 +412,23 @@
 	{
 		gint64 block_file_size;
 
+#ifdef __linux__
 		if (ioctl (tmp_fd, BLKGETSIZE64, &block_file_size) != 0)
 		{
 			set_error (self, _("Error attempting to read block device"));
 			return FALSE;
 		}
+#endif
+#ifdef __sun__
+		struct dk_minfo dkmp;
+
+		if (ioctl (tmp_fd, DKIOCGMEDIAINFO, &dkmp) != 0)
+		{
+			set_error (self, _("Error attempting to read block device"));
+			return FALSE;
+		}
+		block_file_size = dkmp.dki_capacity * dkmp.dki_lbsize;
+#endif
 		bytes = block_file_size;
 	}