Do not install libc-XXXX.h files in "make install".

 glibc does not have them, so should be safe.

Makefile.in

@@ -205,8 +205,8 @@ install_headers: headers $(top_builddir)extra/scripts/unifdef
 	$(INSTALL) -d $(PREFIX)$(DEVEL_PREFIX)include
 	top_builddir=$(top_builddir) \
 	$(top_srcdir)extra/scripts/install_headers.sh include $(PREFIX)$(DEVEL_PREFIX)include
-	printf '#ifndef _LIBC_INTERNAL_H\n#define _LIBC_INTERNAL_H 1\n#endif\n' > \
-		$(PREFIX)$(DEVEL_PREFIX)include/libc-internal.h
+	# Disabled. If libc-internal.h is needed, document here why!
+	#printf '#ifndef _LIBC_INTERNAL_H\n#define _LIBC_INTERNAL_H 1\n#endif\n' >$(PREFIX)$(DEVEL_PREFIX)include/libc-internal.h
 	echo '/* Dont use _syscall#() macros; use the syscall() function */' > \
 		$(PREFIX)$(DEVEL_PREFIX)include/bits/syscalls.h
 	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/dl-osinfo.h

extra/scripts/install_headers.sh

@@ -41,13 +41,20 @@ IFS=''
 while read -r filename; do
 	if test -d "$1/$filename"; then
 		mkdir -p "$2/$filename" 2>/dev/null
-	else
-		# NB: unifdef exits with 1 if output is not
-		# exactly the same as input. That's ok.
-		# Do not abort the script if unifdef "fails"!
-		"$top_builddir/extra/scripts/unifdef" -UUCLIBC_INTERNAL "$1/$filename" \
-		    | sed -e '/^\(rtld\|lib\(c\|m\|resolv\|dl\|intl\|rt\|nsl\|util\|crypt\|pthread\)\)_hidden_proto[ 	]*([a-zA-Z0-9_]*)$/d' >"$2/$filename"
+		continue
 	fi
+	if test x"${filename##libc-*.h}" = x""; then
+		# Do not install libc-XXXX.h files
+		continue
+	fi
+	# NB: unifdef exits with 1 if output is not
+	# exactly the same as input. That's ok.
+	# Do not abort the script if unifdef "fails"!
+	# NB2: careful with sed command arguments, they contain tab character
+	"$top_builddir/extra/scripts/unifdef" -UUCLIBC_INTERNAL -U_LIBC "$1/$filename" \
+	| sed -e '/^rtld_hidden_proto[ 	]*([a-zA-Z0-9_]*)$/d' \
+	| sed -e '/^lib\(c\|m\|resolv\|dl\|intl\|rt\|nsl\|util\|crypt\|pthread\)_hidden_proto[ 	]*([a-zA-Z0-9_]*)$/d' \
+	>"$2/$filename"
 done
 )