Add specs for ConfigureAc
Add specs for header_search_paths' deprecation
Add specs for Builder#run
Add specs for Autoconf::Version#decide
Add specs for create_makedepend
fix compiler switch in example 5
replace deprecated header_search_paths with installable_headers
fix compiler warning, remove semicolon
Group methods
Add specs for Builder#load_local_config
Add specs for Builder#load_makedepend
Whitespace
add spec for local_config with namespace
Revert "add spec for local_config with namespace"

This reverts commit 84d6255ffae61c142377ca41b7162c390d6baa37.
Extract Installer
Ensure Logger namespaces are distinguished.
Add specs for Formatter
Whitespace
Add specs for compiler
add spec for local_config with namespace