looks like your freebsd is too old, latest termcap.src i have has op in
rxvt-256color:

# Termcap entry for rxvt-unicode, taken from 
http://cvs.schmorp.de/rxvt-unicode/doc/rxvt.7.html#I_need_a_termcap_file_entry
rxvt-unicode|rxvt-unicode terminal (X Window System):\
        :SF=\E[%dS:SR=\E[%dT:bw:ec=\E[%dX:kb=\177:kd=\EOB:ke=\E[?1l\E>:\
        :kl=\EOD:kr=\EOC:ks=\E[?1h\E=:ku=\EOA:lm#0:te=\E[r\E[?1049l:\
        :ti=\E[?1049h:tc=rxvt-mono:

rxvt|rxvt terminal emulator (X Window System):\
        :pa#64:Co#8:AF=\E[3%dm:AB=\E[4%dm:op=\E[39;49m:tc=rxvt-mono:

rxvt-256color|rxvt terminal emulator with 256 colors:\
        :Co#256:pa#32767:\
        :AB=\E[48;5;%dm:AF=\E[38;5;%dm:op=\E[39;49m:tc=rxvt-unicode:

rxvt-unicode-256color|rxvt-unicode terminal with 256 colors (X Window System):\
        :tc=rxvt-256color:


On Sun, Nov 06, 2011 at 11:55:23AM +0000, Nicholas Marriott wrote:
> tmux will always use terminfo, whether that is converted internally from
> termcap by ncurses or what is not that important, it'll do the same for
> the stuff tmux gets as for infocmp if they are linked against the same
> ncurses. Actually the best way to check what tmux is using is probably
> to look at tmux server-info output:
> 
> $ tmux info|egrep '(AX|op):'
>  0: AX: [missing]
> 129: op: (string) \033[39;49m
> 
> Your termcap entries do not have either AX or op, so they will both be
> missing. This means tmux can't tell that the terminal supports default
> colours and has to fallback on assuming the default is white on black (7
> on 0).
> 
> Either fix the entries directly to add the AX flag or op=\E[39;49m or do
> the following in .tmux.conf:
> 
> set -ga terminal-overrides ",rxvt-unicode*:AX"
> 
> 
> On Sun, Nov 06, 2011 at 12:13:00PM +0100, Natacha Port? wrote:
> > Hello,
> > 
> > on Sunday 06 November 2011 at 10:14, Nicholas Marriott wrote:
> > > Yes terminals have a default colour pair (if they have AX or op in
> > > terminfo anyway), it's set with \033[39m and \033[49m or sgr0.
> > 
> > I was expecting terminal emulators like rxvt-unicode to have a default
> > color pair, but I thought tmux did not have any, and was simply re-using
> > the default from the terminal in the client.
> > 
> > > \033[38;5;7m is right for rxvt-unicode-256color if tmux wants to set
> > > colour 7 (it's the same as tput setaf 7|cat -v) but tmux should not be
> > > setting colour 7, it should be setting the default colour after \033[m
> > > (either using sgr0 or \033[39m).
> > 
> > I don't really understand from where this 7 comes, unless it's some kind
> > of default color pair internal to tmux, but then how can such a value be
> > set?
> > 
> > > But this works for me fine with rxvt-unicode-256color, can you send me
> > > the output of infocmp -x in rxvt-unicode?
> > 
> > As I said in my previous e-mail, there are two ncurses with two
> > different databases, and it messes things up. For example
> > `tput setaf 7 | cat -v` outputs "^[[23m", but that's because tput is
> > using the terminfo database from port ncurses, while tmux uses
> > (probably) termcap database from base ncurses, which contains
> > :AF=\E[38;5;%dm:
> > 
> > Here are the relevant termcap entries (I hope it's not too spamy):
> > 
> > rxvt-mono|rxvt terminal emulator (monochrome) (X Window System):\
> >         :am:eo:km:mi:ms:xn:xo:\
> >         :co#80:it#8:li#24:\
> >         :AL=\E[%dL:DC=\E[%dP:DL=\E[%dM:DO=\E[%dB:IC=\E[%d@:\
> >         :K1=\EOw:K2=\EOu:K3=\EOy:K4=\EOq:K5=\EOs:LE=\E[%dD:\
> >         :RI=\E[%dC:UP=\E[%dA:ae=\E(B:al=\E[L:as=\E(0:bl=^G:cd=\E[J:\
> >         :ce=\E[K:cl=\E[H\E[2J:cm=\E[%i%d;%dH:cr=^M:\
> >         :cs=\E[%i%d;%dr:ct=\E[3g:dc=\E[P:dl=\E[M:do=^J:ei=\E[4l:\
> >         :ho=\E[H:i1=\E[?47l\E=\E[?1l:ic=\E[@:im=\E[4h:\
> >         :is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l\E[4l:\
> >         :k0=\E[21~:k1=\E[11~:k2=\E[12~:k3=\E[13~:k4=\E[14~:\
> >         :k5=\E[15~:k6=\E[17~:k7=\E[18~:k8=\E[19~:k9=\E[20~:\
> >         :kD=\E[3~:kI=\E[2~:kN=\E[6~:kP=\E[5~:kb=^H:kd=\E[B:ke=\E>:\
> >         :kh=\E[7~:@7=\E[8~:kl=\E[D:kr=\E[C:ks=\E=:ku=\E[A:le=^H:mb=\E[5m:\
> >         :md=\E[1m:me=\E[m\017:mr=\E[7m:nd=\E[C:rc=\E8:sc=\E7:\
> >         :se=\E[27m:sf=^J:so=\E[7m:sr=\EM:st=\EH:ta=^I:\
> >         :te=\E[?47l\E8:ti=\E7\E[?47h:ue=\E[24m:up=\E[A:us=\E[4m:\
> >         :vb=\E[?5h\E[?5l:ve=\E[?25h:vi=\E[?25l:vs=\E[?25h:
> > 
> > rxvt-unicode|rxvt-unicode terminal (X Window System):\
> >         :SF=\E[%dS:SR=\E[%dT:bw:ec=\E[%dX:kb=\177:kd=\EOB:ke=\E[?1l\E>:\
> >         :kl=\EOD:kr=\EOC:ks=\E[?1h\E=:ku=\EOA:lm#0:te=\E[r\E[?1049l:\
> >         :ti=\E[?1049h:tc=rxvt-mono:
> > 
> > rxvt-256color|rxvt terminal emulator with 256 colors:\
> >         :Co#256:AF=\E[38;5;%dm:AB=\E[48;5;%dm:tc=rxvt-unicode:
> > 
> > rxvt-unicode-256color|rxvt-unicode disambiguation:\
> >         :so=\E[7m:se=\E[27m:ZH=\E[3m:ZR=\E[23m:\
> >         :tc=rxvt-256color:
> > 
> > The last entry is from my $HOME/.termcap, while the rest comes from
> > system /usr/share/misc/termcap (symlinked as /etc/termcap). Because the
> > changes to $HOME/.termcap were reflected immediately, I think there is
> > no compilation needed.
> > 
> > The main reason for using the last entry was that in port ncurses
> > database, rxvt-256color refers to 256 color version of rxvt (it makes
> > sense) and not of rxvt-unicode. So at first it was only an alias, and
> > when I was tmux FAQ about reverse-video versus italics with
> > rxvt-unicode, I added so/se and ZH/ZR capabilities.
> > 
> > Now if you're asking for `infocmp` output, I guess you're more familiar
> > with terminfo format than termcap, so I will try to merge the above
> > entries and convert them. Since I'm not completely certain I'm doing it
> > right, and whether port ncurses tool interprets termcap exactly like
> > base ncurses libraries, you should probably consider the above termcap
> > much more reliable than the below terminfo.
> > 
> > rxvt-unicode-256color|rxvt-unicode disambiguation,
> >         am, bw, eo, km, mir, msgr, xenl, xon,
> >         colors#256, cols#80, it#8, lines#24, lm#0,
> >         acsc=``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
> >         bel=^G, blink=\E[5m, bold=\E[1m, civis=\E[?25l,
> >         clear=\E[H\E[2J, cnorm=\E[?25h, cr=^M,
> >         csr=\E[%i%p1%d;%p2%dr, cub=\E[%p1%dD, cub1=^H,
> >         cud=\E[%p1%dB, cud1=^J, cuf=\E[%p1%dC, cuf1=\E[C,
> >         cup=\E[%i%p1%d;%p2%dH, cuu=\E[%p1%dA, cuu1=\E[A,
> >         cvvis=\E[?25h, dch=\E[%p1%dP, dch1=\E[P, dl=\E[%p1%dM,
> >         dl1=\E[M, ech=\E[%p1%dX, ed=\E[J, el=\E[K,
> >         flash=\E[?5h\E[?5l, home=\E[H, ht=^I, hts=\EH,
> >         ich=\E[%p1%d@, ich1=\E[@, il=\E[%p1%dL, il1=\E[L, ind=^J,
> >         indn=\E[%p1%dS, is1=\E[?47l\E=\E[?1l,
> >         is2=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l\E[4l,
> >         ka1=\EOw, ka3=\EOy, kb2=\EOu, kbs=\177, kc1=\EOq, kc3=\EOs,
> >         kcub1=\EOD, kcud1=\EOB, kcuf1=\EOC, kcuu1=\EOA,
> >         kdch1=\E[3~, kend=\E[8~, kf0=\E[21~, kf1=\E[11~,
> >         kf2=\E[12~, kf3=\E[13~, kf4=\E[14~, kf5=\E[15~, kf6=\E[17~,
> >         kf7=\E[18~, kf8=\E[19~, kf9=\E[20~, khome=\E[7~,
> >         kich1=\E[2~, knp=\E[6~, kpp=\E[5~, nel=^M^J, rc=\E8,
> >         rev=\E[7m, ri=\EM, rin=\E[%p1%dT, ritm=\E[23m, rmacs=\E(B,
> >         rmcup=\E[r\E[?1049l, rmir=\E[4l, rmkx=\E[?1l\E>,
> >         rmso=\E[27m, rmul=\E[24m, sc=\E7, setab=\E[48;5;%p1%dm,
> >         setaf=\E[38;5;%p1%dm, sgr0=\E[m\017, sitm=\E[3m,
> >         smacs=\E(0, smcup=\E[?1049h, smir=\E[4h, smkx=\E[?1h\E=,
> >         smso=\E[7m, smul=\E[4m, tbc=\E[3g,
> > 
> > By the way, I'm surprised by the number of differences between this and
> > the (irrelevant for now) terminfo entry in ported ncurses. However I
> > have no idea how to test which one is the most accurate.
> > 
> > 
> > Thanks for your help,
> > Natacha Port?

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