diff --git a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/Libcurl.java b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/Libcurl.java
index 924db7b..6675a4c 100644
--- a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/Libcurl.java
+++ b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/Libcurl.java
@@ -1,17 +1,17 @@
 package io.github.digitalsmile.gpio.libcurl;
 
 import io.github.digitalsmile.annotation.NativeMemory;
+import io.github.digitalsmile.annotation.NativeMemoryException;
 import io.github.digitalsmile.annotation.NativeMemoryOptions;
 import io.github.digitalsmile.annotation.function.ByAddress;
 import io.github.digitalsmile.annotation.function.NativeManualFunction;
-import io.github.digitalsmile.annotation.NativeMemoryException;
 import io.github.digitalsmile.annotation.structure.Enum;
 import io.github.digitalsmile.annotation.structure.Enums;
 import io.github.digitalsmile.annotation.structure.Struct;
 import io.github.digitalsmile.annotation.structure.Structs;
-import io.github.digitalsmile.gpio.libcurl.enums.CURLcode;
-import io.github.digitalsmile.gpio.libcurl.enums.CURLoption;
-import io.github.digitalsmile.gpio.libcurl.opaque.CURL;
+import io.github.digitalsmile.gpio.libcurl.enums.CURLCode;
+import io.github.digitalsmile.gpio.libcurl.enums.CURLOption;
+import io.github.digitalsmile.gpio.libcurl.opaque.CurlInstance;
 
 @NativeMemory(headers = "libcurl/curl/include/curl/curl.h")
 @NativeMemoryOptions(systemIncludes = {
@@ -27,17 +27,17 @@
 public interface Libcurl {
 
     @NativeManualFunction(name = "curl_easy_init", library = "/usr/lib/x86_64-linux-gnu/libcurl.so")
-    CURL easyInit() throws NativeMemoryException;
+    CurlInstance easyInit() throws NativeMemoryException;
 
     @NativeManualFunction(name = "curl_global_init", library = "/usr/lib/x86_64-linux-gnu/libcurl.so")
-    CURLcode globalInit(long flags) throws NativeMemoryException;
+    CURLCode globalInit(long flags) throws NativeMemoryException;
 
     @NativeManualFunction(name = "curl_easy_setopt", library = "/usr/lib/x86_64-linux-gnu/libcurl.so")
-    CURLcode easySetOpt(CURL curl, CURLoption option, String value) throws NativeMemoryException;
+    CURLCode easySetOpt(CurlInstance curl, CURLOption option, String value) throws NativeMemoryException;
 
     @NativeManualFunction(name = "curl_easy_setopt", library = "/usr/lib/x86_64-linux-gnu/libcurl.so")
-    CURLcode easySetOpt(CURL curl, CURLoption option, @ByAddress long value) throws NativeMemoryException;
+    CURLCode easySetOpt(CurlInstance curl, CURLOption option, @ByAddress long value) throws NativeMemoryException;
 
     @NativeManualFunction(name = "curl_easy_perform", library = "/usr/lib/x86_64-linux-gnu/libcurl.so")
-    CURLcode easyPerform(CURL curl) throws NativeMemoryException;
+    CURLCode easyPerform(CurlInstance curl) throws NativeMemoryException;
 }
diff --git a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/LibcurlTest.java b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/LibcurlTest.java
index 8e7ce2a..e3cdb21 100644
--- a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/LibcurlTest.java
+++ b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/libcurl/LibcurlTest.java
@@ -1,41 +1,27 @@
 package io.github.digitalsmile.gpio.libcurl;
 
 import io.github.digitalsmile.annotation.NativeMemoryException;
-import io.github.digitalsmile.gpio.libcurl.enums.CURLcode;
-import io.github.digitalsmile.gpio.libcurl.enums.CURLoption;
+import io.github.digitalsmile.gpio.libcurl.enums.CURLCode;
+import io.github.digitalsmile.gpio.libcurl.enums.CURLOption;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+
 public class LibcurlTest {
 
     @Test
     public void libcurl() throws NativeMemoryException {
-        try(var libcurl = new LibcurlNative()) {
-            var code = libcurl.globalInit(CurlConstants.CURL_GLOBAL_DEFAULT);
-            assertEquals(code, CURLcode.CURLE_OK);
-            var curl = libcurl.easyInit();
-            code = libcurl.easySetOpt(curl, CURLoption.CURLOPT_URL, "https://example.com");
-            assertEquals(code, CURLcode.CURLE_OK);
-            code = libcurl.easySetOpt(curl, CURLoption.CURLOPT_FOLLOWLOCATION, 1L);
-            assertEquals(code, CURLcode.CURLE_OK);
-
-            code = libcurl.easyPerform(curl);
-            assertEquals(code, CURLcode.CURLE_OK);
-        }
-    }
-
-    public static void main(String[] args) throws NativeMemoryException {
-        try(var libcurl = new LibcurlNative()) {
+        try (var libcurl = new LibcurlNative()) {
             var code = libcurl.globalInit(CurlConstants.CURL_GLOBAL_DEFAULT);
-            assertEquals(code, CURLcode.CURLE_OK);
+            assertEquals(code, CURLCode.CURLE_OK);
             var curl = libcurl.easyInit();
-            code = libcurl.easySetOpt(curl, CURLoption.CURLOPT_URL, "https://example.com");
-            assertEquals(code, CURLcode.CURLE_OK);
-            code = libcurl.easySetOpt(curl, CURLoption.CURLOPT_FOLLOWLOCATION, 1L);
-            assertEquals(code, CURLcode.CURLE_OK);
+            code = libcurl.easySetOpt(curl, CURLOption.CURLOPT_URL, "https://example.com");
+            assertEquals(code, CURLCode.CURLE_OK);
+            code = libcurl.easySetOpt(curl, CURLOption.CURLOPT_FOLLOWLOCATION, 1L);
+            assertEquals(code, CURLCode.CURLE_OK);
 
             code = libcurl.easyPerform(curl);
-            assertEquals(code, CURLcode.CURLE_OK);
+            assertEquals(code, CURLCode.CURLE_OK);
         }
     }
 }
diff --git a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/shared/SharedTestTwo.java b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/shared/SharedTestTwo.java
index bad44b8..8dc512f 100644
--- a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/shared/SharedTestTwo.java
+++ b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/shared/SharedTestTwo.java
@@ -12,7 +12,7 @@
 @NativeMemory(headers = "/usr/include/x86_64-linux-gnu/sys/stat.h")
 @NativeMemoryOptions(systemHeader = true)
 @Structs(
-        @Struct(name = "stat")
+        @Struct(name = "stat", javaName = "Stat")
 )
 public interface SharedTestTwo {
 
diff --git a/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/types/custom/GPIOTest.java b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/types/custom/GPIOTest.java
new file mode 100644
index 0000000..dd3afc8
--- /dev/null
+++ b/annotation-processor-test/src/test/java/io/github/digitalsmile/gpio/types/custom/GPIOTest.java
@@ -0,0 +1,27 @@
+package io.github.digitalsmile.gpio.types.custom;
+
+import io.github.digitalsmile.annotation.NativeMemory;
+import io.github.digitalsmile.annotation.NativeMemoryOptions;
+import io.github.digitalsmile.annotation.structure.Enums;
+import io.github.digitalsmile.annotation.structure.Struct;
+import io.github.digitalsmile.annotation.structure.Structs;
+import io.github.digitalsmile.annotation.structure.Unions;
+
+@NativeMemory(headers = "/usr/src/linux-headers-${version}/include/uapi/linux/gpio.h")
+@NativeMemoryOptions(
+        processRootConstants = true
+)
+@Structs({
+        @Struct(name = "gpiochip_info", javaName = "ChipInfo"),
+        @Struct(name = "gpio_v2_line_attribute", javaName = "LineAttribute"),
+        @Struct(name = "gpio_v2_line_config", javaName = "LineConfig"),
+        @Struct(name = "gpio_v2_line_config_attribute", javaName = "LineConfigAttribute"),
+        @Struct(name = "gpio_v2_line_event", javaName = "LineEvent"),
+        @Struct(name = "gpio_v2_line_info", javaName = "LineInfo"),
+        @Struct(name = "gpio_v2_line_request", javaName = "LineRequest"),
+        @Struct(name = "gpio_v2_line_values", javaName = "LineValues")
+})
+@Enums
+@Unions
+public interface GPIOTest {
+}
diff --git a/annotation-processor/src/main/java/io/github/digitalsmile/NativeProcessor.java b/annotation-processor/src/main/java/io/github/digitalsmile/NativeProcessor.java
index 96c8cbe..0906ea0 100644
--- a/annotation-processor/src/main/java/io/github/digitalsmile/NativeProcessor.java
+++ b/annotation-processor/src/main/java/io/github/digitalsmile/NativeProcessor.java
@@ -112,14 +112,17 @@ private List<NativeMemoryNode> processHeaderFiles(Element element, String[] head
         List<Type> structs = null;
         if (structsAnnotation != null) {
             structs = Arrays.stream(structsAnnotation.value()).map(struct -> new Type(struct.name(), struct.javaName())).toList();
+            Arrays.stream(structsAnnotation.value()).forEach(struct -> PrettyName.addName(struct.name(), struct.javaName()));
         }
         List<Type> enums = null;
         if (enumsAnnotation != null) {
             enums = Arrays.stream(enumsAnnotation.value()).map(enoom -> new Type(enoom.name(), enoom.javaName())).toList();
+            Arrays.stream(enumsAnnotation.value()).forEach(enoom -> PrettyName.addName(enoom.name(), enoom.javaName()));
         }
         List<Type> unions = null;
         if (unionsAnnotation != null) {
             unions = Arrays.stream(unionsAnnotation.value()).map(union -> new Type(union.name(), union.javaName())).toList();
+            Arrays.stream(unionsAnnotation.value()).forEach(union -> PrettyName.addName(union.name(), union.javaName()));
         }
 
         var rootConstants = false;
diff --git a/annotation-processor/src/main/java/io/github/digitalsmile/PrettyName.java b/annotation-processor/src/main/java/io/github/digitalsmile/PrettyName.java
index 0238f54..649728f 100644
--- a/annotation-processor/src/main/java/io/github/digitalsmile/PrettyName.java
+++ b/annotation-processor/src/main/java/io/github/digitalsmile/PrettyName.java
@@ -15,7 +15,7 @@ public static void addName(String name, String javaName) {
     public static String getVariableName(String name) {
         var cachedName = NAMING_CACHE.get(name);
         if (cachedName != null) {
-            return cachedName;
+            name = cachedName;
         }
         name = checkJavaName(name);
         if (name.matches("([a-z]+[a-zA-Z0-9]+)+")) {
@@ -38,7 +38,7 @@ public static String getVariableName(String name) {
     public static String getObjectName(String name) {
         var cachedName = NAMING_CACHE.get(name);
         if (cachedName != null) {
-            return cachedName;
+            name = cachedName;
         }
         name = checkJavaName(name);
         if (name.matches("([A-Z]+[a-zA-Z0-9]+)+")) {
diff --git a/annotation-processor/src/main/java/io/github/digitalsmile/composers/ContextComposer.java b/annotation-processor/src/main/java/io/github/digitalsmile/composers/ContextComposer.java
index 36ff7e9..9d98b72 100644
--- a/annotation-processor/src/main/java/io/github/digitalsmile/composers/ContextComposer.java
+++ b/annotation-processor/src/main/java/io/github/digitalsmile/composers/ContextComposer.java
@@ -2,6 +2,7 @@
 
 import com.squareup.javapoet.*;
 import io.github.digitalsmile.PackageName;
+import io.github.digitalsmile.PrettyName;
 import io.github.digitalsmile.annotation.ArenaType;
 import io.github.digitalsmile.annotation.function.NativeCall;
 import io.github.digitalsmile.annotation.types.interfaces.NativeMemoryContext;
@@ -88,7 +89,7 @@ public String compose(String packageName, String javaName, Map<Library, List<Fun
                         parameters.add(CodeBlock.builder().add("$T.ADDRESS", ValueLayout.class).build());
                     } else if (node.getNodeType().isEnum()) {
                         var parameterPackageName = PackageName.getPackageName(type.typeName());
-                        var typeName = ClassName.get(parameterPackageName, type.typeName());
+                        var typeName = ClassName.get(parameterPackageName, PrettyName.getObjectName(type.typeName()));
                         parameters.add(CodeBlock.builder().add("$T.LAYOUT", typeName).build());
                     } else {
                         parameters.add(CodeBlock.builder().add("$T.$L", ValueLayout.class, type.valueLayoutName()).build());
diff --git a/annotation-processor/src/main/java/io/github/digitalsmile/headers/model/NativeMemoryNode.java b/annotation-processor/src/main/java/io/github/digitalsmile/headers/model/NativeMemoryNode.java
index dd6a907..18989b3 100644
--- a/annotation-processor/src/main/java/io/github/digitalsmile/headers/model/NativeMemoryNode.java
+++ b/annotation-processor/src/main/java/io/github/digitalsmile/headers/model/NativeMemoryNode.java
@@ -6,6 +6,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 public class NativeMemoryNode implements Node {
     private final String name;