diff --git a/src/SPC/builder/linux/SystemUtil.php b/src/SPC/builder/linux/SystemUtil.php
index 056af090d..30b36b888 100644
--- a/src/SPC/builder/linux/SystemUtil.php
+++ b/src/SPC/builder/linux/SystemUtil.php
@@ -141,7 +141,7 @@ public static function getSupportedDistros(): array
     {
         return [
             // debian-like
-            'debian', 'ubuntu', 'Deepin',
+            'debian', 'ubuntu', 'Deepin', 'neon',
             // rhel-like
             'redhat',
             // centos
diff --git a/src/SPC/doctor/item/LinuxToolCheckList.php b/src/SPC/doctor/item/LinuxToolCheckList.php
index ab8144a21..08a2b4dc9 100644
--- a/src/SPC/doctor/item/LinuxToolCheckList.php
+++ b/src/SPC/doctor/item/LinuxToolCheckList.php
@@ -112,7 +112,7 @@ public function checkSystemOSPackages(): ?CheckResult
     public function fixBuildTools(array $distro, array $missing): bool
     {
         $install_cmd = match ($distro['dist']) {
-            'ubuntu', 'debian', 'Deepin' => 'apt-get install -y',
+            'ubuntu', 'debian', 'Deepin', 'neon' => 'apt-get install -y',
             'alpine' => 'apk add',
             'redhat' => 'dnf install -y',
             'centos' => 'yum install -y',
@@ -128,7 +128,7 @@ public function fixBuildTools(array $distro, array $missing): bool
             logger()->warning('Current user (' . $user . ') is not root, using sudo for running command (may require password input)');
         }
 
-        $is_debian = in_array($distro['dist'], ['debian', 'ubuntu', 'Deepin']);
+        $is_debian = in_array($distro['dist'], ['debian', 'ubuntu', 'Deepin', 'neon']);
         $to_install = $is_debian ? str_replace('xz', 'xz-utils', $missing) : $missing;
         // debian, alpine libtool -> libtoolize
         $to_install = str_replace('libtoolize', 'libtool', $to_install);
diff --git a/src/StaticPHP/Artifact/ArtifactDownloader.php b/src/StaticPHP/Artifact/ArtifactDownloader.php
index a42bed7b4..4fb651cfb 100644
--- a/src/StaticPHP/Artifact/ArtifactDownloader.php
+++ b/src/StaticPHP/Artifact/ArtifactDownloader.php
@@ -397,7 +397,12 @@ private function downloadWithType(Artifact $artifact, int $current, int $total,
                     $instance = new $call();
                     $lock = $instance->download($artifact->getName(), $item['config'], $this);
                 } else {
-                    throw new ValidationException("Artifact has invalid download type '{$item['config']['type']}' for {$item['display']}.");
+                    if ($item['config']['type'] === 'custom') {
+                        $msg = "Artifact [{$artifact->getName()}] has no valid custom " . SystemTarget::getCurrentPlatformString() . ' download callback defined.';
+                    } else {
+                        $msg = "Artifact has invalid download type '{$item['config']['type']}' for {$item['display']}.";
+                    }
+                    throw new ValidationException($msg);
                 }
                 if (!$lock instanceof DownloadResult) {
                     throw new ValidationException("Artifact {$artifact->getName()} has invalid custom return value. Must be instance of DownloadResult.");
diff --git a/src/StaticPHP/Doctor/Doctor.php b/src/StaticPHP/Doctor/Doctor.php
index 8141fa32f..692a5b8c5 100644
--- a/src/StaticPHP/Doctor/Doctor.php
+++ b/src/StaticPHP/Doctor/Doctor.php
@@ -34,7 +34,7 @@ public function checkAll(bool $interactive = true): bool
             InteractiveTerm::notice('Starting doctor checks ...');
         }
         foreach ($this->getValidCheckList() as $check) {
-            if (!$this->checkItem($check)) {
+            if (!$this->checkItem($check, $interactive)) {
                 return false;
             }
         }
@@ -47,7 +47,7 @@ public function checkAll(bool $interactive = true): bool
      * @param  CheckItem|string $check The check item to be checked
      * @return bool             True if the check passed or was fixed, false otherwise
      */
-    public function checkItem(CheckItem|string $check): bool
+    public function checkItem(CheckItem|string $check, bool $interactive = true): bool
     {
         if (is_string($check)) {
             $found = null;
@@ -63,7 +63,8 @@ public function checkItem(CheckItem|string $check): bool
             }
             $check = $found;
         }
-        $this->output?->write("Checking <comment>{$check->item_name}</comment> ... ");
+        $prepend = $interactive ? '  - ' : '';
+        $this->output?->write("{$prepend}Checking <comment>{$check->item_name}</comment> ... ");
 
         // call check
         $result = call_user_func($check->callback);
diff --git a/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php b/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
index 1cfc7afdd..4d7a86bee 100644
--- a/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
+++ b/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
@@ -13,6 +13,7 @@
 use StaticPHP\DI\ApplicationContext;
 use StaticPHP\Doctor\CheckResult;
 use StaticPHP\Runtime\Shell\Shell;
+use StaticPHP\Toolchain\Interface\ToolchainInterface;
 use StaticPHP\Toolchain\MuslToolchain;
 use StaticPHP\Toolchain\ZigToolchain;
 use StaticPHP\Util\FileSystem;
@@ -25,8 +26,8 @@ class LinuxMuslCheck
 {
     public static function optionalCheck(): bool
     {
-        return getenv('SPC_TOOLCHAIN') === MuslToolchain::class ||
-            (getenv('SPC_TOOLCHAIN') === ZigToolchain::class && !LinuxUtil::isMuslDist());
+        $toolchain = ApplicationContext::get(ToolchainInterface::class);
+        return $toolchain instanceof MuslToolchain || $toolchain instanceof ZigToolchain && !LinuxUtil::isMuslDist();
     }
 
     /** @noinspection PhpUnused */
diff --git a/src/StaticPHP/Util/System/LinuxUtil.php b/src/StaticPHP/Util/System/LinuxUtil.php
index 570907d9e..79ad89ed7 100644
--- a/src/StaticPHP/Util/System/LinuxUtil.php
+++ b/src/StaticPHP/Util/System/LinuxUtil.php
@@ -13,13 +13,14 @@ class LinuxUtil extends UnixUtil
      * Get current linux distro name and version.
      *
      * @noinspection PhpMissingBreakStatementInspection
-     * @return array{dist: string, ver: string} Linux distro info (unknown if not found)
+     * @return array{dist: string, ver: string, family: string} Linux distro info (unknown if not found)
      */
     public static function getOSRelease(): array
     {
         $ret = [
             'dist' => 'unknown',
             'ver' => 'unknown',
+            'family' => 'unknown',
         ];
         switch (true) {
             case file_exists('/etc/centos-release'):
@@ -44,6 +45,9 @@ public static function getOSRelease(): array
                     if (preg_match('/^ID=(.*)$/', $line, $matches)) {
                         $ret['dist'] = $matches[1];
                     }
+                    if (preg_match('/^ID_LIKE=(.*)$/', $line, $matches)) {
+                        $ret['family'] = $matches[1];
+                    }
                     if (preg_match('/^VERSION_ID=(.*)$/', $line, $matches)) {
                         $ret['ver'] = $matches[1];
                     }
@@ -103,6 +107,16 @@ public static function getSupportedDistros(): array
         ];
     }
 
+    /**
+     * Check if current linux distro is debian-based.
+     */
+    public static function isDebianDist(): bool
+    {
+        $dist = static::getOSRelease()['dist'];
+        $family = explode(' ', static::getOSRelease()['family']);
+        return in_array($dist, ['debian', 'ubuntu', 'Deepin', 'neon']) || in_array('debian', $family);
+    }
+
     /**
      * Get libc version string from ldd.
      */