--- nono/configure.ac	2026/04/29 17:04:28	1.1.1.1
+++ nono/configure.ac	2026/04/29 17:04:30	1.1.1.2
@@ -29,6 +29,7 @@ CXXFLAGS="${old_CXXFLAGS}"
 # Checks for header files.
 AC_CHECK_HEADERS([bsd/bsd.h])
 AC_CHECK_HEADERS([endian.h])
+AC_CHECK_HEADERS([histedit.h])
 AC_CHECK_HEADERS([kqueue/sys/event.h])
 AC_CHECK_HEADERS([sys/endian.h])
 AC_CHECK_HEADERS([sys/event.h])
@@ -136,6 +137,15 @@ AC_TRY_COMPILE(,
 		AC_DEFINE([HAVE___BUILTIN_BSWAP32]),
 	AC_MSG_RESULT([no]))
 
+AC_MSG_CHECKING(for __builtin_bswap64)
+AC_TRY_COMPILE(,
+	[
+		return __builtin_bswap64(0);
+	],
+	AC_MSG_RESULT([yes])
+		AC_DEFINE([HAVE___BUILTIN_BSWAP64]),
+	AC_MSG_RESULT([no]))
+
 AC_MSG_CHECKING(for __builtin_expect)
 AC_TRY_COMPILE(,
 	[
@@ -277,6 +287,11 @@ AC_CHECK_LIB(bsd, getprogname,
 	AC_SUBST([LIBBSD_LIBS], [-lbsd]),
 	)
 
+# libedit (editline)
+if test x"$ac_cv_header_histedit_h" = xyes; then
+	AC_SUBST([LIBEDIT_LIBS], ["-ledit -ltermcap"])
+fi
+
 # libkqueue on Linux
 AC_CHECK_LIB(kqueue, kqueue,
 	AC_SUBST([LIBKQUEUE_LIBS], [-lkqueue]),
@@ -325,5 +340,5 @@ AC_CONFIG_FILES([Makefile.cfg
 	util/mkcgrom/Makefile
 	util/viewcgrom/Makefile
 ])
-AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_HEADERS([config-nono.h])
 AC_OUTPUT