Problem: VERSION macro has unbounded parenthesis
Solution: Remove the offending '('
Merge pull request #10 from jemc/master

Problem: Deployment bundles do not include the prelude header
Merge pull request #11 from jemc/version_macro

Problem: VERSION macro has unbounded parenthesis
Add pkg-config based dependencies.
Merge pull request #12 from pmienk/master

Add pkg-config based dependencies to autotools gsl
Problem: Android needs to provide special LDFLAGS to libtool linking
Solution: Accommodate the LIBTOOL_EXTRA_LDFLAGS env var