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diff --git a/mod/build-config-module.hxx b/mod/build-config-module.hxx
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+++ b/mod/build-config-module.hxx
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+// file      : mod/build-config-module.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef MOD_BUILD_CONFIG_MODULE_HXX
+#define MOD_BUILD_CONFIG_MODULE_HXX
+
+#include <map>
+#include <algorithm> // find()
+
+#include <libbutl/utility.mxx> // compare_c_string
+
+#include <libbpkg/manifest.hxx>
+
+#include <libbbot/build-config.hxx>
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+#include <mod/module.hxx>
+#include <mod/options.hxx>
+
+// Base class for modules that utilize the build controller configuration.
+//
+// Specifically, it loads build controller configuration and provides various
+// build configuration-related utilities. Note that the configuration is
+// shared across multiple modules once loaded.
+//
+// Note that the build database is in the database_module.
+//
+namespace brep
+{
+  class build_config_module
+  {
+  protected:
+    // Parse build configuration file and establish mapping of build bot agent
+    // public keys fingerprints to their paths. Throw tab_parsing on parsing
+    // error, system_error on the underlying OS error.
+    //
+    void
+    init (const options::build&);
+
+    // Return true if the specified build configuration is excluded by a
+    // package based on its underlying build class set, build class
+    // expressions, and build constraints, potentially extending the
+    // underlying set with the special classes. Set the exclusion reason if
+    // requested.
+    //
+    bool
+    exclude (const vector<bpkg::build_class_expr>&,
+             const vector<bpkg::build_constraint>&,
+             const bbot::build_config&,
+             string* reason = nullptr) const;
+
+    // Check if the configuration belongs to the specified class.
+    //
+    // Note that the configuration base classes are not checked.
+    //
+    static bool
+    belongs (const bbot::build_config& cfg, const char* cls)
+    {
+      const strings& cs (cfg.classes);
+      return std::find (cs.begin (), cs.end (), cls) != cs.end ();
+    }
+
+    // Convert dash-separated components (target, build configuration name,
+    // machine name) or a pattern thereof into a path, replacing dashes with
+    // slashes (directory separators), `**` with `*/**/*`, and appending the
+    // trailing slash for a subsequent match using the path_match()
+    // functionality (the idea here is for `linux**` to match `linux-gcc`
+    // which is quite natural to expect). Throw invalid_path if the resulting
+    // path is invalid.
+    //
+    // Note that the match_absent path match flag must be used for the above
+    // `**` transformation to work.
+    //
+    static path
+    dash_components_to_path (const string&);
+
+  protected:
+    // Build configurations.
+    //
+    shared_ptr<const bbot::build_configs> build_conf_;
+    shared_ptr<const cstrings>            build_conf_names_;
+
+    shared_ptr<const std::map<const char*,
+                              const bbot::build_config*,
+                              butl::compare_c_string>> build_conf_map_;
+
+    // Map of build bot agent public keys fingerprints to the key file paths.
+    //
+    shared_ptr<const std::map<string, path>> bot_agent_key_map_;
+  };
+}
+
+#endif // MOD_BUILD_CONFIG_MODULE_HXX