The scsh package really should install these header files:

scheme48.h
write-barrier.h

They are normally installed by 'make install' and are found in the c/
subdirectory of the source tree.

They are needed for building some other packages based on scsh, such as
scx.

-- 
Björn Lindström <bkhl@elektrubadur.se>
http://bkhl.elektrubadur.se/