diff --git a/.idea/libraries/dbus_java_3_2_4.xml b/.idea/libraries/dbus_java_3_2_4.xml
new file mode 100644
index 000000000..6acd1b359
--- /dev/null
+++ b/.idea/libraries/dbus_java_3_2_4.xml
@@ -0,0 +1,9 @@
+<component name="libraryTable">
+  <library name="dbus-java-3.2.4">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/compiler/lib/dbus-java-3.2.4.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/kotlinx_cli_jvm_0_1_0_dev_5.xml b/.idea/libraries/kotlinx_cli_jvm.xml
similarity index 71%
rename from .idea/libraries/kotlinx_cli_jvm_0_1_0_dev_5.xml
rename to .idea/libraries/kotlinx_cli_jvm.xml
index 7fee0aedc..759bb47a8 100644
--- a/.idea/libraries/kotlinx_cli_jvm_0_1_0_dev_5.xml
+++ b/.idea/libraries/kotlinx_cli_jvm.xml
@@ -1,7 +1,7 @@
 <component name="libraryTable">
-  <library name="kotlinx-cli-jvm-0.1.0-dev-5">
+  <library name="kotlinx-cli-jvm">
     <CLASSES>
-      <root url="jar://$PROJECT_DIR$/compiler/lib/kotlinx-cli-jvm-0.1.0-dev-5.jar!/" />
+      <root url="jar://$PROJECT_DIR$/compiler/lib/kotlinx-cli-jvm-0.3.1.jar!/" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/compiler/build.gradle b/compiler/build.gradle
index 5e1834491..b5dc39077 100644
--- a/compiler/build.gradle
+++ b/compiler/build.gradle
@@ -21,8 +21,7 @@ sourceCompatibility = 11
 repositories {
     mavenLocal()
     mavenCentral()
-    jcenter()
-    maven { url "https://dl.bintray.com/orangy/maven/" }
+    maven { url "https://kotlin.bintray.com/kotlinx" }
 }
 
 def prog8version = rootProject.file('compiler/res/version.txt').text.trim()
@@ -32,9 +31,9 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     // implementation "org.jetbrains.kotlin:kotlin-reflect"
     implementation 'org.antlr:antlr4-runtime:4.8'
-    implementation 'org.jetbrains.kotlinx:kotlinx-cli-jvm:0.1.0-dev-5'
-    // implementation 'net.razorvine:ksim65:1.6'
-    // implementation "com.github.hypfvieh:dbus-java:3.2.0"
+    implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.1'
+    // implementation 'net.razorvine:ksim65:1.8'
+    // implementation "com.github.hypfvieh:dbus-java:3.2.4"
     implementation project(':parser')
 
     testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
diff --git a/compiler/compiler.iml b/compiler/compiler.iml
index 3abee245a..3f43bfff8 100644
--- a/compiler/compiler.iml
+++ b/compiler/compiler.iml
@@ -13,7 +13,7 @@
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
     <orderEntry type="module" module-name="parser" />
     <orderEntry type="library" name="unittest-libs" level="project" />
-    <orderEntry type="library" name="kotlinx-cli-jvm-0.1.0-dev-5" level="project" />
+    <orderEntry type="library" name="kotlinx-cli-jvm" level="project" />
     <orderEntry type="library" name="antlr-runtime-4.9" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/compiler/lib/dbus-java-3.2.0.jar b/compiler/lib/dbus-java-3.2.0.jar
deleted file mode 100644
index fe4fbc7a9..000000000
Binary files a/compiler/lib/dbus-java-3.2.0.jar and /dev/null differ
diff --git a/compiler/lib/dbus-java-3.2.4.jar b/compiler/lib/dbus-java-3.2.4.jar
new file mode 100644
index 000000000..3a0cff3c3
Binary files /dev/null and b/compiler/lib/dbus-java-3.2.4.jar differ
diff --git a/compiler/lib/kotlinx-cli-jvm-0.1.0-dev-5.jar b/compiler/lib/kotlinx-cli-jvm-0.1.0-dev-5.jar
deleted file mode 100644
index 2edc1e111..000000000
Binary files a/compiler/lib/kotlinx-cli-jvm-0.1.0-dev-5.jar and /dev/null differ
diff --git a/compiler/lib/kotlinx-cli-jvm-0.3.1.jar b/compiler/lib/kotlinx-cli-jvm-0.3.1.jar
new file mode 100644
index 000000000..9b93814ca
Binary files /dev/null and b/compiler/lib/kotlinx-cli-jvm-0.3.1.jar differ
diff --git a/compiler/src/prog8/CompilerMain.kt b/compiler/src/prog8/CompilerMain.kt
index 4b6d2f91b..726edb2b3 100644
--- a/compiler/src/prog8/CompilerMain.kt
+++ b/compiler/src/prog8/CompilerMain.kt
@@ -32,20 +32,20 @@ fun pathFrom(stringPath: String, vararg rest: String): Path  = FileSystems.getDe
 
 
 private fun compileMain(args: Array<String>) {
-    val cli = CommandLineInterface("prog8compiler")
-    val startEmulator by cli.flagArgument("-emu", "auto-start emulator after successful compilation")
-    val outputDir by cli.flagValueArgument("-out", "directory", "directory for output files instead of current directory", ".")
-    val dontWriteAssembly by cli.flagArgument("-noasm", "don't create assembly code")
-    val dontOptimize by cli.flagArgument("-noopt", "don't perform any optimizations")
-    val watchMode by cli.flagArgument("-watch", "continuous compilation mode (watches for file changes), greatly increases compilation speed")
-    val slowCodegenWarnings by cli.flagArgument("-slowwarn", "show debug warnings about slow/problematic assembly code generation")
-    val compilationTarget by cli.flagValueArgument("-target", "compilertarget",
-            "target output of the compiler, currently '${C64Target.name}' and '${Cx16Target.name}' available", C64Target.name)
-    val moduleFiles by cli.positionalArgumentsList("modules", "main module file(s) to compile", minArgs = 1)
+    val cli = ArgParser("prog8compiler")
+    val startEmulator by cli.option(ArgType.Boolean, shortName="emu", description = "auto-start emulator after successful compilation")
+    val outputDir by cli.option(ArgType.String, shortName = "out", description = "directory for output files instead of current directory").default(".")
+    val dontWriteAssembly by cli.option(ArgType.Boolean, shortName = "noasm", description="don't create assembly code")
+    val dontOptimize by cli.option(ArgType.Boolean, shortName = "noopt", description = "don't perform any optimizations")
+    val watchMode by cli.option(ArgType.Boolean, shortName = "watch", description = "continuous compilation mode (watches for file changes), greatly increases compilation speed")
+    val slowCodegenWarnings by cli.option(ArgType.Boolean, shortName = "slowwarn", description="show debug warnings about slow/problematic assembly code generation")
+    val compilationTarget by cli.option(ArgType.String, shortName = "target", description = "target output of the compiler, currently '${C64Target.name}' and '${Cx16Target.name}' available").default(C64Target.name)
+    val moduleFiles by cli.argument(ArgType.String, fullName = "modules", description = "main module file(s) to compile").multiple(999)
 
     try {
         cli.parse(args)
-    } catch (e: Exception) {
+    } catch (e: IllegalStateException) {
+        System.err.println(e.message)
         exitProcess(1)
     }
 
@@ -55,7 +55,7 @@ private fun compileMain(args: Array<String>) {
         exitProcess(1)
     }
 
-    if(watchMode) {
+    if(watchMode==true) {
         val watchservice = FileSystems.getDefault().newWatchService()
         val allImportedFiles = mutableSetOf<Path>()
 
@@ -64,7 +64,7 @@ private fun compileMain(args: Array<String>) {
             val results = mutableListOf<CompilationResult>()
             for(filepathRaw in moduleFiles) {
                 val filepath = pathFrom(filepathRaw).normalize()
-                val compilationResult = compileProgram(filepath, !dontOptimize, !dontWriteAssembly, slowCodegenWarnings, compilationTarget, outputPath)
+                val compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, outputPath)
                 results.add(compilationResult)
             }
 
@@ -101,7 +101,7 @@ private fun compileMain(args: Array<String>) {
             val filepath = pathFrom(filepathRaw).normalize()
             val compilationResult: CompilationResult
             try {
-                compilationResult = compileProgram(filepath, !dontOptimize, !dontWriteAssembly, slowCodegenWarnings, compilationTarget, outputPath)
+                compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, outputPath)
                 if(!compilationResult.success)
                     exitProcess(1)
             } catch (x: ParsingFailedError) {
@@ -110,10 +110,10 @@ private fun compileMain(args: Array<String>) {
                 exitProcess(1)
             }
 
-            if (startEmulator) {
+            if (startEmulator==true) {
                 if (compilationResult.programName.isEmpty())
                     println("\nCan't start emulator because no program was assembled.")
-                else if(startEmulator) {
+                else {
                     CompilationTarget.instance.machine.launchEmulator(compilationResult.programName)
                 }
             }