I read:
3.2 [debian]
. .
checking for tcl8.1/tcl.h... no checking for tcl8.2/tcl.h... no checking for tcl8.3/tcl.h... no checking for tcl8.4/tcl.h... no checking for tcl8.5/tcl.h... no checking for tcl8.6/tcl.h... no checking for tcl8.7/tcl.h... no no tcl/tk header found
. .
apt-get install tk8.3-dev
HTH
x