diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5421534..b578892 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,7 +18,7 @@ if (${TARGET} STREQUAL PICO)
     include(pico_sdk_import.cmake)
 endif()
 
-project(pjvm VERSION 0.0.4)
+project(pjvm VERSION 0.0.6)
 
 include(CTest) 
 
@@ -116,7 +116,7 @@ if (${TARGET} STREQUAL PICO)
             DESTINATION .
             RENAME pjvm-${PROJECT_VERSION}.uf2
     )
-    install(PROGRAMS ${CMAKE_SOURCE_DIR}/tools/wrapjar.sh ${CMAKE_SOURCE_DIR}/lib/tools/preverify/bin/preverify
+    install(PROGRAMS ${CMAKE_SOURCE_DIR}/tools/wrapjar.sh ${BINARY_DIR}/preverify-prefix/src/preverify-build/preverify
             DESTINATION bin
     )
     install(DIRECTORY ${CMAKE_BINARY_DIR}/doc
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index f827139..e9eb0f7 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -10,6 +10,14 @@ include(ExternalProject)
 
 project(jvm)
 
+#
+# Build the host utilities that are used to build the classes library
+#
+
+#
+# Build ROMGEN, this is actually the VM but its built to generate a 
+# ROM image of the classes library
+#
 ExternalProject_Add(romgen SOURCE_DIR ${CMAKE_SOURCE_DIR}/tools/romgen 
                            CMAKE_ARGS -DROMGEN_VERSION=${LIBJVM_VERSION}
                                       -DCMAKE_BUILD_TYPE:STRING=Release
@@ -19,6 +27,20 @@ ExternalProject_Add(romgen SOURCE_DIR ${CMAKE_SOURCE_DIR}/tools/romgen
                            INSTALL_COMMAND cmake -E echo "Skipping install step."
 )
 ExternalProject_Get_property(romgen BINARY_DIR)
+set(ROMGEN_BINARY_DIR ${BINARY_DIR})
+
+#
+# Build PREVERIFY to transform the classes before running on the target
+#
+ExternalProject_Add(preverify SOURCE_DIR ${CMAKE_SOURCE_DIR}/tools/preverify
+                              CMAKE_ARGS -DCMAKE_BUILD_TYPE:STRING=Release
+                              USES_TERMINAL_BUILD TRUE
+                              BUILD_ALWAYS TRUE
+                              BUILD_BYPRODUCTS ${CMAKE_BINARY_DIR}/preverify-prefix/src/preverify-build/preverify
+                              INSTALL_COMMAND cmake -E echo "Skipping install step."
+)
+ExternalProject_Get_property(preverify BINARY_DIR)
+set(PREVERIFY_BINARY_DIR ${BINARY_DIR})
 
 if (${TARGET} STREQUAL PICO)
     set(CMAKE_C_COMPILER   arm-none-eabi-gcc)
@@ -136,15 +158,15 @@ set(JVM_CLASSES
 )
 
 add_custom_command(OUTPUT ROMImage.cpp
-                   DEPENDS ${JVM_CLASSES} ${BINARY_DIR}/romgen
+                   DEPENDS ${JVM_CLASSES} ${ROMGEN_BINARY_DIR}/romgen
                    COMMAND rm ARGS -rf ${CMAKE_BINARY_DIR}/classes ${CMAKE_BINARY_DIR}/classes.preverify
                    COMMAND mkdir ARGS -p ${CMAKE_BINARY_DIR}/classes
                    COMMAND javac ARGS -source 1.4 -target 1.4 -d ${CMAKE_BINARY_DIR}/classes -bootclasspath ${CMAKE_BINARY_DIR}/classes ${JVM_CLASSES}
-                   COMMAND ${CMAKE_SOURCE_DIR}/tools/preverify/bin/preverify ARGS -d ${CMAKE_BINARY_DIR}/classes.preverify ${CMAKE_BINARY_DIR}/classes
+                   COMMAND ${PREVERIFY_BINARY_DIR}/preverify ARGS -d ${CMAKE_BINARY_DIR}/classes.preverify ${CMAKE_BINARY_DIR}/classes
                    COMMAND cd ARGS ${CMAKE_BINARY_DIR}/classes.preverify
                    COMMAND jar ARGS -cfM0 ${CMAKE_BINARY_DIR}/classes.jar .
                    COMMAND cd ARGS ${CMAKE_BINARY_DIR}
-                   COMMAND ${BINARY_DIR}/romgen 
+                   COMMAND ${ROMGEN_BINARY_DIR}/romgen 
                                     -cp ${CMAKE_BINARY_DIR}/classes.jar
                                     +RewriteROMConstantPool
                                     +EnableAllROMOptimizations
@@ -154,7 +176,7 @@ add_custom_command(OUTPUT ROMImage.cpp
                                     -romincludepath ${CMAKE_SOURCE_DIR}/src/vm
                                     -romize
 )
-add_custom_target(classes ALL DEPENDS ROMImage.cpp romgen)
+add_custom_target(classes ALL DEPENDS ROMImage.cpp romgen preverify)
 
 if (${TARGET} STREQUAL PICO)
     add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/doc
diff --git a/lib/tools/preverify/CMakeLists.txt b/lib/tools/preverify/CMakeLists.txt
index 6ad47a0..427dd42 100644
--- a/lib/tools/preverify/CMakeLists.txt
+++ b/lib/tools/preverify/CMakeLists.txt
@@ -26,4 +26,6 @@ add_executable(preverify
 
 target_compile_definitions(preverify PRIVATE UNIX JAVAVERIFY TRIMMED ARCH=i386)
 target_include_directories(preverify PRIVATE src)
-target_compile_options(preverify PRIVATE)
+target_compile_options(preverify PRIVATE -m32 -Werror)
+target_link_options(preverify PRIVATE -m32)
+
diff --git a/lib/tools/preverify/bin/preverify b/lib/tools/preverify/bin/preverify
deleted file mode 100755
index d0542d6..0000000
Binary files a/lib/tools/preverify/bin/preverify and /dev/null differ
diff --git a/lib/tools/preverify/src/check_code.c b/lib/tools/preverify/src/check_code.c
index 509a906..e7aa011 100644
--- a/lib/tools/preverify/src/check_code.c
+++ b/lib/tools/preverify/src/check_code.c
@@ -23,6 +23,9 @@
  * information or have any questions.
  */
  
+ /*
+ * Modified (C) Oren Sokoler (https://github.com/orenskl) 
+ */
 
 /*=========================================================================
  * SYSTEM:    Verifier
@@ -37,6 +40,8 @@
  * Include files
  *=======================================================================*/
 
+#include <arpa/inet.h>
+
 #include <check_code.h>
 
 #include <opcodes.length>
diff --git a/lib/tools/preverify/src/file.c b/lib/tools/preverify/src/file.c
index 9529c55..4c971a4 100644
--- a/lib/tools/preverify/src/file.c
+++ b/lib/tools/preverify/src/file.c
@@ -23,6 +23,10 @@
  * information or have any questions.
  */
 
+/*
+ * Modified (C) Oren Sokoler (https://github.com/orenskl) 
+ */
+
 /*=========================================================================
  * SYSTEM:    Verifier
  * SUBSYSTEM: Operations on class files.
@@ -608,7 +612,7 @@ void
 WriteClass(ClassClass *cb)
 {
     int fd;
-    char fname[1024];
+    char fname[BUFSIZ + 1024];
     char buff[BUFSIZ];
     char *nativeName = &buff[0];
 
@@ -725,7 +729,7 @@ WriteClass(ClassClass *cb)
     }
 
     tmpDirExists = TRUE;   /* tmpDir exists with verified classes */
-    write(fd, class_buf, class_index);
+    size_t rv = write(fd, class_buf, class_index);
     close(fd);
     free(class_buf);
     class_buf_size = 0;
diff --git a/lib/tools/preverify/src/jar_support.c b/lib/tools/preverify/src/jar_support.c
index b4b0ce4..cf1bf61 100644
--- a/lib/tools/preverify/src/jar_support.c
+++ b/lib/tools/preverify/src/jar_support.c
@@ -23,6 +23,10 @@
  * information or have any questions.
  */
 
+/*
+ * Modified (C) Oren Sokoler (https://github.com/orenskl) 
+ */
+
 /*=========================================================================
  * SYSTEM:    Verifier
  * SUBSYSTEM: JAR support routines for the verifier.
@@ -44,6 +48,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <sys_api.h>
 #include <path_md.h>
@@ -495,7 +500,7 @@ loadJARfile(zip_t *entry, const char* filename)
             if (compLen != decompLen) {
                 return NULL;
             }
-            fread(decompData, sizeof(char), decompLen, file);
+            size_t rv = fread(decompData, sizeof(char), decompLen, file);
             break;
 
         case DEFLATED: {
@@ -681,7 +686,7 @@ ReadFromZip(zip_t *entry)
                         jdstream = NULL;
                         goto done;
                     }
-                    fread(decompData, sizeof(char), decompLen, file);
+                    size_t rv = fread(decompData, sizeof(char), decompLen, file);
                     break;
 
                 case DEFLATED: {
@@ -790,7 +795,7 @@ ReadFromZip(zip_t *entry)
                             "Writing file [%s]...\n", sfname);
 
                         /* write the file to the tmpdir just created */
-                        write(fd, decompData, decompLen);
+                        size_t rv = write(fd, decompData, decompLen);
 
                         /* check for the JAR Manifest.mf file */
 
diff --git a/lib/tools/preverify/src/main.c b/lib/tools/preverify/src/main.c
index aa36b27..af0118b 100644
--- a/lib/tools/preverify/src/main.c
+++ b/lib/tools/preverify/src/main.c
@@ -23,6 +23,10 @@
  * information or have any questions.
  */
 
+/*
+ * Modified (C) Oren Sokoler (https://github.com/orenskl) 
+ */
+
 /*=========================================================================
  * SYSTEM:    Verifier
  * SUBSYSTEM: main program
@@ -52,8 +56,6 @@
  * Globals and extern declarations
  *=======================================================================*/
 
-char str_buffer[STRINGBUFFERSIZE];   /*  shared string buffer */
-
 int processedfile = 0;
 int errorCode = 0;               /* Error code returned by program */
 
@@ -232,8 +234,7 @@ static void ProcessInputs(char *argname)
  *                argv: arg value(s)
  *   returns:     nothing
  *=======================================================================*/
-int main(argc, argv)
-    register char **argv;
+int main(int argc, char ** argv)
 {
     char *progname;
     char *argv0 = argv[0];
diff --git a/lib/tools/preverify/src/typedefs_md.h b/lib/tools/preverify/src/typedefs_md.h
index e1a0101..b422b1d 100644
--- a/lib/tools/preverify/src/typedefs_md.h
+++ b/lib/tools/preverify/src/typedefs_md.h
@@ -23,6 +23,10 @@
  * information or have any questions.
  */
 
+/*
+ * Modified (C) Oren Sokoler (https://github.com/orenskl) 
+ */
+
 #ifndef _TYPES_MD_H_
 #define _TYPES_MD_H_
 
@@ -52,12 +56,7 @@ typedef long int32_t;
 #endif /* SOLARIS2 */
 
 #ifdef __linux__
-#ifndef       _UINT64_T
-#define       _UINT64_T
-typedef unsigned long long uint64_t;
-#define _UINT32_T
-typedef unsigned long uint32_t;
-#endif
+#include <stdint.h>
 #endif /* __linux__ */
 
 #ifdef DARWIN