Configured, built and installed successfully on Xubuntu 16.04 and Xubuntu 18.04 after installing tcl/tk8.6, but still needed explicit addition of -I/usr/include/tcl8.6 :
sudo apt-get install tcl8.6-dev tk8.6-dev
./configure --prefix=/home/me --with-tclconfig=/usr/lib/tcl8.6 --with-tkconfig=/usr/lib/tk8.6 CPPFLAGS=-I/usr/include/tcl8.6
make
make install
Configured, built and installed successfully on Xubuntu 16.04 and Xubuntu 18.04 after installing tcl/tk8.6, but still needed explicit addition of -I/usr/ include/ tcl8.6 :
sudo apt-get install tcl8.6-dev tk8.6-dev
./configure --prefix=/home/me --with- tclconfig= /usr/lib/ tcl8.6 --with- tkconfig= /usr/lib/ tk8.6 CPPFLAGS= -I/usr/ include/ tcl8.6
make
make install