Fix missing headers for old python versions on darwin

src/builder/darwin.ts

@@ -64,8 +64,8 @@ export default class MacOSBuilder extends Builder {
       });
       sqlite = sqlite.trim();
       core.info(`sqlite3 module path: ${sqlite}`);
-      process.env['LDFLAGS'] += ` -L${sqlite}/lib`;
-      process.env['CFLAGS'] += ` -I${sqlite}/include`;
+      process.env['LDFLAGS'] += `-L${sqlite}/lib `;
+      process.env['CFLAGS'] += `-I${sqlite}/include `;
       process.env['CPPFLAGS'] += `-I${sqlite}/include`;
     }
     if (semver.gte(this.specificVersion, '3.7.0')) {
@@ -166,10 +166,10 @@ export default class MacOSBuilder extends Builder {
     if (semver.lt(this.specificVersion, '3.7.0')) {
       process.env[
         'LDFLAGS'
-      ] += `-L${this.sslPath}/lib -L${zlibPath}/lib -L${readLinePath}/lib`;
+      ] += `-L${this.sslPath}/lib -L${zlibPath}/lib -L${readLinePath}/lib `;
       process.env[
         'CFLAGS'
-      ] += `-I${this.sslPath}/include -I${zlibPath}/include -I${readLinePath}/lib`;
+      ] += `-I${this.sslPath}/include -I${zlibPath}/include -I${readLinePath}/include `;
     }
     core.info(`OpenSSL path: ${this.sslPath}`);
 
@@ -185,6 +185,34 @@ export default class MacOSBuilder extends Builder {
       process.env['SVNVERSION'] = 'Unversioned directory';
     }
 
+    // Fix for missing header files
+
+    if (
+      semver.gte(this.specificVersion, '3.0.0') &&
+      semver.lt(this.specificVersion, '3.1.0')
+    ) {
+      core.info(
+        'Detected Python version==3.0.x. Applying fix for missing headers...'
+      );
+      let headerPath = '';
+      await exec.exec('xcrun --sdk macosx --show-sdk-path', [], {
+        listeners: {
+          stdout: (buffer: Buffer) => {
+            headerPath = headerPath.concat(buffer.toString());
+          }
+        }
+      });
+      headerPath = headerPath.trim();
+      await exec.exec('ln -x', [
+        path.join(headerPath, 'usr', 'lib', 'netinet'),
+        '/usr/lib/netinet'
+      ]);
+      await exec.exec('ln -x', [
+        path.join(headerPath, 'usr', 'include', 'netinet'),
+        '/usr/include/netinet'
+      ]);
+    }
+
     core.endGroup();
   }