Build Failure on 1.9

[ujihisa]

$ gem install rpeg-markdown
Building native extensions.  This could take a while...
ERROR:  Error installing rpeg-markdown:
        ERROR: Failed to build gem native extension.

/Users/ujihisa/git/ruby/local/bin/ruby extconf.rb
checking for pkg-config... yes
creating extconf.h
creating Makefile

make
Makefile:61: *** missing separator.  Stop.


Gem files will remain installed in /Users/ujihisa/.gem/ruby/1.9.1/gems/rpeg-markdown-1.4.6 for inspection.
Results logged to /Users/ujihisa/.gem/ruby/1.9.1/gems/rpeg-markdown-1.4.6/ext/gem_make.out

The reason is that the Makefile line #60 is splitted into two lined with a \n; I ascertained that I could build if I fixed the Makefile manually.