missing IRBuilder.h

% ./configure
...
Pure is now configured for LLVM 2.2 on i686-pc-linux-gnu.

  Source directory:     .
  Installation prefix:  /usr/local
  Compiler:             g++ -g -O2 
  Linker:               g++  -lgsl -lgslcblas -lm -lreadline 
  Build libpure:        yes
  Versioned install:    yes
  GSL support:          yes

% make
g++ -g -O2  -I/usr/include/llvm  -D_DEBUG  -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -I. -I. -DPURELIB='"/usr/local/lib/pure-0.20"' -c -o pure.o pure.cc
In file included from pure.cc:15:
interpreter.hh:12:36: error: llvm/Support/IRBuilder.h: No such file or directory
In file included from interpreter.hh:18,
                 from pure.cc:15:
expr.hh:7:17: error: gmp.h: No such file or directory