I have an Ubuntu server 20.04 LTS and I can´t rebuild R-3.4.1 with tcltk support .

I tried using ./configure --prefix=/opt/R --with-tcltk , but it stills showing the message:

error: Tcl/Tk support is not available on this system

Also I have installed tcl8.6 tcl8.6-dev tk8.6 and tk8.6 dev

Any sugestions