commit 2a26443ced2052246e43b3cd544c185bdbf78d89
Author: Mark Johnston <markjdb@gmail.com>
Date:   Thu Mar 7 15:43:23 2019 -0500

    Add endian.h to LHDRS.
    
    Many applications expect to be able to include <endian.h> so this is a
    compatibility sore.  Just make a symlink, like OpenBSD does.  NetBSD
    uses a stub header which includes sys/endian.h, but I don't see a good
    reason for that.  We use symlinks for lots of headers today.

diff --git a/include/Makefile b/include/Makefile
index d1b000cf8a8e..17f2838b4653 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -36,8 +36,8 @@ MHDRS=	float.h floatingpoint.h stdarg.h
 
 PHDRS=	sched.h _semaphore.h
 
-LHDRS=	aio.h errno.h fcntl.h linker_set.h poll.h stdatomic.h stdint.h \
-	syslog.h ucontext.h
+LHDRS=	aio.h endian.h errno.h fcntl.h linker_set.h poll.h stdatomic.h \
+	stdint.h syslog.h ucontext.h
 
 LDIRS=	bsm cam geom net net80211 netgraph netinet netinet6 \
 	netipsec netsmb nfs nfsclient nfsserver sys vm