include libdwfl.h

[William Cohen]

I tried building the most recent snapshot of the systemtap. The 
"./configure" goes fine. However, building it wasn't able to find 
elfutils/libdwfl.h:

make 'CXXFLAGS=-g -O2' 'LDFLAGS=' all-am
make[1]: Entering directory `/home/wcohen/systemtap_write/src'
if g++ -DDEFPATH="\".:/usr/local/share/systemtap\"" -DHAVE_CONFIG_H -I. 
-I. -I.    -Wall -g -O2 -MT tapsets.o -MD -MP -MF ".deps/tapsets.Tpo" -c 
-o tapsets.o tapsets.cxx; \
then mv -f ".deps/tapsets.Tpo" ".deps/tapsets.Po"; else rm -f 
".deps/tapsets.Tpo"; exit 1; fi
tapsets.cxx:23:30: error: elfutils/libdwfl.h: No such file or directory
tapsets.cxx:346: error: ISO C++ forbids declaration of ‘Dwfl’ with no type
tapsets.cxx:346: error: expected ‘;’ before ‘*’ token
...

What is supplying the /usr/include/elfutils/libdwfl.h? This file doesn't 
appear on the current rawhide installation I have.

-Will