1 files changed, 23 insertions, 6 deletions
diff --git a/util.h b/util.h
index 6a51806..332fb79 100644
--- a/util.h
+++ b/util.h
@@ -39,12 +39,29 @@
 #	define BFS_HAS_INCLUDE(header, fallback) fallback
 #endif
 
-#define BFS_HAS_MNTENT         BFS_HAS_INCLUDE(<mntent.h>, __GLIBC__)
-#define BFS_HAS_SYS_ACL        BFS_HAS_INCLUDE(<sys/acl.h>, true)
-#define BFS_HAS_SYS_CAPABILITY BFS_HAS_INCLUDE(<sys/capability.h>, __linux__)
-#define BFS_HAS_SYS_MKDEV      BFS_HAS_INCLUDE(<sys/mkdev.h>, false)
-#define BFS_HAS_SYS_PARAM      BFS_HAS_INCLUDE(<sys/param.h>, true)
-#define BFS_HAS_SYS_SYSMACROS  BFS_HAS_INCLUDE(<sys/sysmacros.h>, __GLIBC__)
+#ifndef BFS_HAS_MNTENT
+#	define BFS_HAS_MNTENT BFS_HAS_INCLUDE(<mntent.h>, __GLIBC__)
+#endif
+
+#ifndef BFS_HAS_SYS_ACL
+#	define BFS_HAS_SYS_ACL BFS_HAS_INCLUDE(<sys/acl.h>, true)
+#endif
+
+#ifndef BFS_HAS_SYS_CAPABILITY
+#	define BFS_HAS_SYS_CAPABILITY BFS_HAS_INCLUDE(<sys/capability.h>, __linux__)
+#endif
+
+#ifndef BFS_HAS_SYS_MKDEV
+#	define BFS_HAS_SYS_MKDEV BFS_HAS_INCLUDE(<sys/mkdev.h>, false)
+#endif
+
+#ifndef BFS_HAS_SYS_PARAM
+#	define BFS_HAS_SYS_PARAM BFS_HAS_INCLUDE(<sys/param.h>, true)
+#endif
+
+#ifndef BFS_HAS_SYS_SYSMACROS
+#	define BFS_HAS_SYS_SYSMACROS BFS_HAS_INCLUDE(<sys/sysmacros.h>, __GLIBC__)
+#endif
 
 #if !defined(FNM_CASEFOLD) && defined(FNM_IGNORECASE)
 #	define FNM_CASEFOLD FNM_IGNORECASE