To install tcl.h log in as root then

	sed -i s/gpgcheck=1/gpgcheck=0/ /etc/yum.repos.d/fedora* /etc/yum.conf
	yum install tcl-devel.i386

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If the above two lines do not do the trick,
below is a more detailed equivalent to those two lines
that might be tried instead
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If we try to install newest pd we are told that we need
tcl.h
(actually a netrc guru told me we also need the related tk.h)


to find out where we can get tcl.h
	yum list *tcl*
will tell us which package names contain tcl.h
and found one that contained it was called tcl-devel.i386, so we say
	yum install tcl-devel.i386

But then we are asked for a GPGkey
(GPG is like PGP, like MD5, SFV etc).
No gurus or anyone could tell us how to get such a key so
we decided to disbale checking for GPGkey
This we did like this...
	man yum
	man yum.conf
which implies we need to do
	vi /etc/yum.conf
	:%s/gpgcheck=1/gpgcheck=0
then we exit vi
	cd /etc/yum.repos.d/
	sed -i s/gpgcheck=1/gpgcheck=0/ fedora*

We guessed that for tk.h we do
	yum install tk-devel.i386