diff --git a/commands/common.ts b/commands/common.ts
index 34e5195..912286c 100644
--- a/commands/common.ts
+++ b/commands/common.ts
@@ -8,3 +8,8 @@ export const optFlag = (flag: string, opt: string | undefined) => undefList(opt,
  * Generate a switch flag, like "--rebuild", "--nobuild"
  */
 export const optSwitch = (flag: string, opt: boolean | undefined) => undefList(opt, opt => opt ? [flag] : [])
+
+export const optMultiFlag = (flag: string, opt: string[] | undefined) =>
+    undefList(
+        opt,
+        opt => opt.flatMap(name => [flag, name]))
diff --git a/commands/compiler.ts b/commands/compiler.ts
index 63aa039..a3649d3 100644
--- a/commands/compiler.ts
+++ b/commands/compiler.ts
@@ -1,7 +1,9 @@
-import { optFlag, optSwitch, undefList } from "./common";
+import { optFlag, optMultiFlag, optSwitch, undefList } from "./common";
 
 export interface GeneralOptions {
-    output?: string;
+    output?: string
+
+    sysroot?: string
 
     outputKind?: "exe" | "object" | "assembly" | "preprocessed"
 }
@@ -20,7 +22,28 @@ export function generalCommand(options: GeneralOptions) {
                 case "preprocessed":
                     return ["-E"]
             }
-        })
+        }),
+        ...optFlag("--sysroot", options.sysroot),
+    ]
+}
+
+interface LinkerOptions {
+    /**
+     * Directory searched for "-l"
+     */
+    searchDirs?: string[];
+
+    /**
+     * -l libraries.
+     * Static library dependecies must be sorted in topologic order.
+     */
+    libraries?: string[];
+}
+
+export function linkerCommand(options: LinkerOptions) {
+    return [
+        ...optMultiFlag("-L", options.searchDirs),
+        ...optMultiFlag("-l", options.libraries),
     ]
 }
 
@@ -30,7 +53,7 @@ export interface PreprocessorOptions {
 
 export function preprocessorCommand(options: PreprocessorOptions) {
     return [
-        ...undefList(options.includeDirs, dirs => dirs.flatMap(name => ["-I", name]))
+        ...optMultiFlag("-I", options.includeDirs),
     ]
 }
 
@@ -61,8 +84,8 @@ export interface ExtractOptions {
 
 export function extractCommand(options: ExtractOptions): string[] {
     return [
-        ...undefList(options.func, func => func.flatMap(name => ["--func", name])),
-        ...undefList(options.bb, bb => bb.flatMap(name => ["--bb", name])),
+        ...optMultiFlag("--func", options.func),
+        ...optMultiFlag("--bb", options.bb),
         ...optFlag("-o", options.output),
         ...optSwitch("-S", options.asm),
         ...undefList(options.input, input => [input])