add event support

src/SPC/builder/unix/library/libevent.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\unix\library;
+
+use SPC\store\FileSystem;
+
+trait libevent
+{
+    protected function build()
+    {
+        // CMake needs a clean build directory
+        FileSystem::resetDir($this->source_dir . '/build');
+        // Start build
+        shell()->cd($this->source_dir . '/build')
+            ->exec(
+                "{$this->builder->configure_env} cmake " .
+                '-DCMAKE_INSTALL_PREFIX=' . BUILD_ROOT_PATH . ' ' .
+                "-DCMAKE_TOOLCHAIN_FILE={$this->builder->cmake_toolchain_file} " .
+                '-DCMAKE_BUILD_TYPE=Release ' .
+                '-DEVENT__LIBRARY_TYPE=STATIC ' .
+                '-DEVENT__DISABLE_BENCHMARK=ON ' .
+                '-DEVENT__DISABLE_THREAD_SUPPORT=ON ' .
+                '-DEVENT__DISABLE_TESTS=ON ' .
+                '-DEVENT__DISABLE_SAMPLES=ON ' .
+                '..'
+            )
+            ->exec("cmake --build . -j {$this->builder->concurrency}")
+            ->exec('make install');
+        // patch pkgconfig
+    }
+}