# pull in limits.h to get correct definition of MB_LEN_MAX for/from glibc
diff -r ac69f5926743 frm/frm.h
--- a/frm/frm.h	Sat Jan 19 19:23:36 2019 +0000
+++ b/frm/frm.h	Sat Jan 19 19:25:06 2019 +0000
@@ -27,20 +27,21 @@
 #include <sys/types.h>
 #ifdef HAVE_TERMIOS_H
 # include <termios.h>
 #endif
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 
 #ifdef HAVE_ICONV_H
 # include <iconv.h>
 #endif
+#include <limits.h>
 #ifndef MB_LEN_MAX
 # define MB_LEN_MAX 4
 #endif
 
 #include <mbswidth.h>
 
 #ifdef HAVE_FRIBIDI_FRIBIDI_H
 # include <fribidi/fribidi.h>
 #endif