diff --git a/core/src/fr/hammons/slinc/LibraryI.scala b/core/src/fr/hammons/slinc/LibraryI.scala
index c1c1a4f1..011d92e1 100644
--- a/core/src/fr/hammons/slinc/LibraryI.scala
+++ b/core/src/fr/hammons/slinc/LibraryI.scala
@@ -33,6 +33,7 @@ object LibraryI:
     def getLocalLookup(name: String): Lookup
     def getLibraryPathLookup(name: String): Lookup
     def getStandardLibLookup: Lookup
+    def getResourceLibLookup(location: String): Lookup
 
   def checkMethodIsCompatible(using q: Quotes)(s: q.reflect.Symbol): Unit =
     import quotes.reflect.*
@@ -237,20 +238,15 @@ object LibraryI:
       platformSpecificExpr: Expr[PlatformSpecific]
   )(using Quotes, Type[L]) =
     import quotes.reflect.*
-    val name: Option[LibraryLocation] = LibraryName.libraryName[L]
+    val name: LibraryLocation = LibraryName.libraryName[L]
     name match
-      case None => '{ $platformSpecificExpr.getStandardLibLookup }
-      case Some(LibraryLocation.Local(s)) =>
+      case LibraryLocation.Standardard => '{ $platformSpecificExpr.getStandardLibLookup }
+      case LibraryLocation.Local(s) =>
         '{ $platformSpecificExpr.getLocalLookup(${ Expr(s) }) }
-      case Some(LibraryLocation.Path(s)) =>
+      case LibraryLocation.Path(s) =>
         '{ $platformSpecificExpr.getLibraryPathLookup(${ Expr(s) }) }
-      case Some(LibraryLocation.Resource(s)) =>
-        val sExpr = Expr(s)
-        val clPath = '{
-          Tools.sendResourceToCache($sExpr)
-          Tools.compileCachedResourceIfNeeded($sExpr).toAbsolutePath().nn.toString()
-        }
-        '{ $platformSpecificExpr.getLocalLookup($clPath ) }
+      case LibraryLocation.Resource(s) =>
+        '{ $platformSpecificExpr.getResourceLibLookup(${Expr(s)} ) }
 
   inline def getMethodAddress[L](l: Lookup) = ${
     getMethodAddressImpl[L]('l)
diff --git a/core/src/fr/hammons/slinc/LibraryName.scala b/core/src/fr/hammons/slinc/LibraryName.scala
index c80fb55c..a08afc54 100644
--- a/core/src/fr/hammons/slinc/LibraryName.scala
+++ b/core/src/fr/hammons/slinc/LibraryName.scala
@@ -9,6 +9,7 @@ enum LibraryLocation:
   case Local(s: String)
   case Resource(s: String)
   case Path(s: String)
+  case Standardard
 
 object LibraryName:
   def libraryName[L](using Quotes, Type[L]) =
@@ -24,4 +25,4 @@ object LibraryName:
       case s"@$path" => LibraryLocation.Resource(path)
       case s"#$path" => LibraryLocation.Path(path)
       case s => LibraryLocation.Local(s)
-    }.headOption
+    }.headOption.getOrElse(LibraryLocation.Standardard)
diff --git a/core/src/fr/hammons/slinc/Lookup.scala b/core/src/fr/hammons/slinc/Lookup.scala
index 40bd7f7c..f0bb5341 100644
--- a/core/src/fr/hammons/slinc/Lookup.scala
+++ b/core/src/fr/hammons/slinc/Lookup.scala
@@ -1,4 +1,17 @@
 package fr.hammons.slinc
 
-private[slinc] trait Lookup:
+import java.nio.file.Path
+import java.nio.file.Paths
+
+trait Lookup(libraryLocation: LibraryLocation):
   def lookup(name: String): Object
+
+  def lookupError(name: String): Error = libraryLocation match
+    case LibraryLocation.Standardard => Error(s"Failed to load symbol $name from the standard library.")
+    case LibraryLocation.Resource(location) => 
+      Error(s"Failed to load symbol $name from resource $location. This could be caused by resource collision. Is the resource name unique enough?")
+    case LibraryLocation.Local(location) => 
+      val absPath = Paths.get(location).nn.toAbsolutePath.nn
+      Error(s"Failed to load symbol $name from local path $absPath")
+    case LibraryLocation.Path(libName) => 
+      Error(s"Failed to load symbol $name from library $libName")
\ No newline at end of file
diff --git a/core/src/fr/hammons/slinc/Tools.scala b/core/src/fr/hammons/slinc/Tools.scala
index 28ee6627..e861fa7f 100644
--- a/core/src/fr/hammons/slinc/Tools.scala
+++ b/core/src/fr/hammons/slinc/Tools.scala
@@ -11,42 +11,55 @@ import java.nio.channels.ByteChannel
 import java.nio.channels.Channels
 import scala.sys.process.*
 
-
-object Tools {
+object Tools:
   private val appDataStore =
-    Paths.get(os match
-      case OS.Windows =>
-        s"${System.getenv("APPDATA").nn}\\local\\slinc\\libstore\\"
-      case OS.Linux => s"${System.getProperty("user.home").nn}/.cache/slinc/"
-      case OS.Darwin =>
-        s"${System.getProperty("user.home").nn}/Library/Application Support/"
-    ).nn
-
-  private val sharedLibSuffix = 
+    Paths
+      .get(os match
+        case OS.Windows =>
+          s"${System.getenv("APPDATA").nn}\\local\\slinc\\libstore\\"
+        case OS.Linux => s"${System.getProperty("user.home").nn}/.cache/slinc/"
+        case OS.Darwin =>
+          s"${System.getProperty("user.home").nn}/Library/Application Support/"
+      )
+      .nn
+
+  private val sharedLibSuffix =
     os match
       case OS.Linux | OS.Darwin => ".so"
-      case OS.Windows => ".dll"
-      case OS.Unknown => throw Error("Cannot do lib compilation on this platform, it's unknown.")    
+      case OS.Windows           => ".dll"
+      case OS.Unknown =>
+        throw Error("Cannot do lib compilation on this platform, it's unknown.")
 
-  def sendResourceToCache(name: String) = 
-    println(name)
+  def sendResourceToCache(name: String): Unit =
     Files.createDirectories(appDataStore)
     val cacheLocation = appDataStore.resolve(s"$name.c")
-    if !Files.exists(appDataStore.resolve(s"$name.c")) then 
-      Files.copy(getClass().getResourceAsStream(s"/native/$name.c"), cacheLocation)
+    println(cacheLocation)
+    if !Files.exists(appDataStore.resolve(s"$name.c")) then
+      val stream = getClass().getResourceAsStream(s"/native/$name.c")
+      if stream != null then Files.copy(stream, cacheLocation)
+      else throw Error(s"Could not find resource /native/$name.c")
 
-  def compileCachedResourceIfNeeded(name: String): Path = 
+  def compileCachedResourceIfNeeded(name: String): Unit =
     val cacheLocation = appDataStore.resolve(s"$name$sharedLibSuffix")
     val headerLocation = appDataStore.resolve(s"$name.c")
 
+    println(headerLocation)
+
     if !Files.exists(cacheLocation) then
-      val cmd = Seq("clang", "-shared", "-Os", "-o", cacheLocation.nn.toAbsolutePath().nn.toString(), headerLocation.nn.toAbsolutePath().nn.toString())
-      if cmd.! != 0 then throw Error(s"failed to compile $headerLocation")
-      
-    cacheLocation.nn
+      val cmd = Seq(
+        "clang",
+        "-shared",
+        "-fvisibility=default",
+        "-Os",
+        "-o",
+        cacheLocation.nn.toAbsolutePath().nn.toString(),
+        headerLocation.nn.toAbsolutePath().nn.toString()
+      )
+      if cmd.! != 0 then throw Error(s"failed to compile $headerLocation: ${cmd.mkString(" ")}")
 
-  def loadCachedLibrary(name: String) = 
-    val cacheLocation = appDataStore.resolve(s"$name.$sharedLibSuffix")
-    System.loadLibrary(cacheLocation.nn.toAbsolutePath().nn.toString())
+  def loadCachedLibrary(name: String) =
+    val cacheLocation = appDataStore.resolve(s"$name$sharedLibSuffix")
+    println(cacheLocation)
+    System.load(cacheLocation.nn.toAbsolutePath().nn.toString())
 
-}
+end Tools
diff --git a/core/test/resources/native/test.c b/core/test/resources/native/test.c
new file mode 100644
index 00000000..6c483841
--- /dev/null
+++ b/core/test/resources/native/test.c
@@ -0,0 +1,13 @@
+#ifdef _WIN32
+# ifdef WIN_EXPORT
+#   define EXPORTED  __declspec( dllexport )
+# else
+#   define EXPORTED  __declspec( dllimport )
+# endif
+#else
+# define EXPORTED
+#endif
+
+EXPORTED int identity_int(int i) {
+  return i;
+}
\ No newline at end of file
diff --git a/core/test/src/fr/hammons/slinc/BindingsSpec.scala b/core/test/src/fr/hammons/slinc/BindingsSpec.scala
index 5b1c3d9b..04a858e0 100644
--- a/core/test/src/fr/hammons/slinc/BindingsSpec.scala
+++ b/core/test/src/fr/hammons/slinc/BindingsSpec.scala
@@ -174,6 +174,7 @@ trait BindingsSpec(val slinc: Slinc) extends ScalaCheckSuite:
   test("int_identity") {
     assertEquals(Test.identity_int(5), 5)
   }
+  Test.identity_int(5)
 
 object BindingsSpec:
   case class div_t(quot: Int, rem: Int)
diff --git a/j17/src/fr/hammons/slinc/Library17.scala b/j17/src/fr/hammons/slinc/Library17.scala
index 0b1d6998..57c7792a 100644
--- a/j17/src/fr/hammons/slinc/Library17.scala
+++ b/j17/src/fr/hammons/slinc/Library17.scala
@@ -46,67 +46,28 @@ class Library17(layoutI: LayoutI, linker: CLinker)
 
     linker.downcallHandle(address.asInstanceOf[Addressable], md, fd).nn
 
-  private val standardLibLookup = new Lookup:
-    val lookupImpl = CLinker.systemLookup.nn
-    def lookup(name: String) = lookupImpl
-      .lookup(name)
-      .nn
-      .orElseThrow(() =>
-        throw Error(s"Failed to load $name from the standard library")
-      )
-      .nn
-
+  class J17Lookup(s: SymbolLookup, libraryLocation: LibraryLocation) extends Lookup(libraryLocation):
+    def lookup(name: String): Object = s.lookup(name).nn.orElseThrow(() => throw this.lookupError(name)).nn
+  private val standardLibLookup = J17Lookup(CLinker.systemLookup().nn,LibraryLocation.Standardard)
   override def getStandardLibLookup: Lookup =
     Tools.hashCode()
 
     standardLibLookup
-
   override def getLibraryPathLookup(libName: String): Lookup =
-    new Lookup:
-      System.loadLibrary(libName)
-      val lookupImpl = SymbolLookup.loaderLookup().nn
-      def lookup(symbolName: String) = lookupImpl
-        .lookup(symbolName)
-        .nn
-        .orElseThrow(() =>
-          throw Error(s"Failed to load ${symbolName} from $libName")
-        )
-        .nn
+    System.loadLibrary(libName)
+    J17Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Path(libName))
+
+
+  override def getResourceLibLookup(location: String): Lookup = 
+    Tools.sendResourceToCache(location)
+    Tools.compileCachedResourceIfNeeded(location)
+    Tools.loadCachedLibrary(location)
+    
+    J17Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Resource(location))
 
   override def getLocalLookup(libPath: String): Lookup =
-    new Lookup:
-      System.load(libPath)
+    System.load(libPath)
 
-      val lookupImpl = SymbolLookup.loaderLookup().nn
-      def lookup(symbolName: String) = lookupImpl
-        .lookup(symbolName)
-        .nn
-        .orElseThrow(() =>
-          throw Error(s"Failed to load $symbolName from $libPath")
-        )
-        .nn
+    J17Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Local(libPath))
 
-  def getLookup(name: Option[String]): Lookup =
-    import scala.jdk.OptionConverters.*
-    name match
-      case Some(n) =>
-        new Lookup:
-          if Files.exists(Paths.get(n)) then
-            System.load(Paths.get(n).nn.toRealPath().nn.toString())
-          else System.loadLibrary(n)
-          val l = SymbolLookup.loaderLookup().nn
-          def lookup(name: String) = l
-            .lookup(name)
-            .nn
-            .toScala
-            .getOrElse(throw Error(s"Failed to load $name from $n"))
-      case None =>
-        new Lookup:
-          val l = CLinker.systemLookup().nn
-          def lookup(name: String) = l
-            .lookup(name)
-            .nn
-            .toScala
-            .getOrElse(
-              throw Error(s"Failed to load $name from standard library")
-            )
+end Library17
\ No newline at end of file
diff --git a/j17/test/resources/native/test.c b/j17/test/resources/native/test.c
deleted file mode 100644
index 0583efdd..00000000
--- a/j17/test/resources/native/test.c
+++ /dev/null
@@ -1,3 +0,0 @@
-int identity_int(int i) {
-  return i;
-}
\ No newline at end of file
diff --git a/j19/src/fr/hammons/slinc/Library19.scala b/j19/src/fr/hammons/slinc/Library19.scala
index 18c7e04e..ccf62157 100644
--- a/j19/src/fr/hammons/slinc/Library19.scala
+++ b/j19/src/fr/hammons/slinc/Library19.scala
@@ -42,28 +42,24 @@ class Library19(layoutI: LayoutI, linker: Linker)
 
     linker.downcallHandle(address.asInstanceOf[Addressable], fd).nn
 
-  override def getLookup(name: Option[String]): Lookup =
-    import scala.jdk.OptionConverters.*
+  class J19Lookup(s: SymbolLookup, l: LibraryLocation) extends Lookup(l):
+    def lookup(name: String): Object = s.lookup(name).nn.orElseThrow(() => this.lookupError(name)).nn
+  override def getLibraryPathLookup(name: String): Lookup = 
+    System.loadLibrary(name)
 
-    name match
-      case Some(n) =>
-        new Lookup:
-          if Files.exists(Paths.get(n)) then
-            System.load(Paths.get(n).nn.toRealPath().nn.toString())
-          else System.loadLibrary(n)
-          val l = SymbolLookup.loaderLookup().nn
-          def lookup(name: String) =
-            l.lookup(name)
-              .nn
-              .toScala
-              .getOrElse(throw Error(s"Lookup of $name in $n failed"))
-      case None =>
-        new Lookup:
-          val l = linker.defaultLookup().nn
-          def lookup(name: String) = l
-            .lookup(name)
-            .nn
-            .toScala
-            .getOrElse(
-              throw Error(s"Lookup of $name in standard library failed")
-            )
+    J19Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Path(name))
+
+  override def getLocalLookup(name: String): Lookup = 
+    System.load(name)
+
+    J19Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Local(name))
+
+  override def getResourceLibLookup(location: String): Lookup = 
+    Tools.sendResourceToCache(location)
+    Tools.compileCachedResourceIfNeeded(location)
+    Tools.loadCachedLibrary(location)
+
+    J19Lookup(SymbolLookup.loaderLookup().nn, LibraryLocation.Resource(location))
+
+  override def getStandardLibLookup: Lookup = J19Lookup(linker.defaultLookup().nn, LibraryLocation.Standardard)
+end Library19
\ No newline at end of file