Current neomutt sidebar patch does change COLS which does
not work with threadsafe ncurses6

---
 configure.ac |    8 ++++++++
 1 file changed, 8 insertions(+)

--- configure.ac
+++ configure.ac	2016-05-23 13:43:40.810914709 +0000
@@ -305,6 +305,14 @@ main ()
                 if test x$mutt_cv_curses != x/usr; then
                         LDFLAGS="$LDFLAGS -L${mutt_cv_curses}/lib"
                         CPPFLAGS="$CPPFLAGS -I${mutt_cv_curses}/include"
+                fi
+                if test -d /usr/include/ncurses5 ; then
+                        if test -d /usr/lib64/ncurses5 ; then
+                            LDFLAGS="$LDFLAGS -L/usr/lib64/ncurses5"
+                        else
+                            LDFLAGS="$LDFLAGS -L/usr/lib/ncurses5"
+                        fi
+                        CPPFLAGS="$CPPFLAGS -I/usr/include/ncurses5"
                 fi])
 
 	AC_CHECK_FUNC(initscr,,[