[Haskell-cafe] pcre-light install fails with undefined reference to _impure_ptr

[Stephen Tetley]

For the record...

The regex-posix package also failed to build for me with GHC 6.12.1 on
Windows with Cygwin due to >> undefined reference to `_impure_ptr' <<
errors.

Again this builds fine with MinGW once you have the GNU regex library
installed (its not installed as a default MSys package). With a
runhaskell Setup.hs ...  install you need to set the
extra-include-dirs to pick up regex.h and the extra-lib-dir to pick up
libregex.a