Dynamically check if the FUSE low-level API is present on the host.

This replaces the hard coded list and should be more flexible if more
platforms decide to support this in the future.

Author: unsound

configure.ac

@@ -167,8 +167,8 @@ if test "x$enable_refs_fuse" = "xyes"; then
 		FUSE_MODULE_LIBS="-lrefuse"
 		;;
 	mingw*)
-		# Dokan is used. Currently the user needs to specify libfuse include and
-		# library paths manually.
+		# Dokan is used. Currently the user needs to specify libfuse
+		# include and library paths manually.
 		;;
 	*)
 		# Other platforms (Linux, FreeBSD, ...) use pkg-config.
@@ -178,6 +178,11 @@ if test "x$enable_refs_fuse" = "xyes"; then
 			[],
 			[]
 		)
+
+		__SAVED_CPPFLAGS="$CPPFLAGS"
+		CPPFLAGS="$CPPFLAGS $FUSE_MODULE_CFLAGS -DFUSE_USE_VERSION=26"
+		AC_CHECK_HEADERS([fuse_lowlevel.h])
+		CPPFLAGS="$__SAVED_CPPFLAGS"
 		;;
 	esac
 fi

util/refs-fuse.c

@@ -30,10 +30,10 @@
 typedef unsigned int mode_t;
 #endif
 
-#if defined(_WIN32) || defined(__NetBSD__) || defined(__OpenBSD__)
-#define REFS_FUSE_USE_LOWLEVEL_API 0
-#else
+#ifdef HAVE_FUSE_LOWLEVEL_H
 #define REFS_FUSE_USE_LOWLEVEL_API 1
+#else
+#define REFS_FUSE_USE_LOWLEVEL_API 0
 #endif
 
 /* Headers - libfuse. */