diff --git a/tools/winebuild/build.h b/tools/winebuild/build.h
index 09bc6fd82ad..ed5bb2a4451 100644
--- a/tools/winebuild/build.h
+++ b/tools/winebuild/build.h
@@ -110,7 +110,7 @@ typedef struct
 
 enum target_cpu
 {
-    CPU_x86, CPU_SPARC, CPU_ALPHA, CPU_POWERPC
+    CPU_x86, CPU_x86_64, CPU_SPARC, CPU_ALPHA, CPU_POWERPC
 };
 
 enum target_platform
@@ -180,9 +180,11 @@ extern void free_dll_spec( DLLSPEC *spec );
 extern const char *make_c_identifier( const char *str );
 extern unsigned int get_alignment(unsigned int align);
 extern unsigned int get_page_size(void);
+extern unsigned int get_ptr_size(void);
 extern const char *asm_name( const char *func );
 extern const char *func_declaration( const char *func );
 extern const char *func_size( const char *func );
+extern const char *get_asm_ptr_keyword(void);
 extern const char *get_asm_string_keyword(void);
 extern const char *get_asm_short_keyword(void);
 
diff --git a/tools/winebuild/import.c b/tools/winebuild/import.c
index 4a14a643f8a..d3cb54a6582 100644
--- a/tools/winebuild/import.c
+++ b/tools/winebuild/import.c
@@ -632,6 +632,7 @@ static void output_import_thunk( FILE *outfile, const char *name, const char *ta
 
     switch(target_cpu)
     {
+    case CPU_x86_64:  /* FIXME */
     case CPU_x86:
         if (!UsePIC)
         {
@@ -976,6 +977,7 @@ static void output_delayed_import_thunks( FILE *outfile, const DLLSPEC *spec )
     fprintf( outfile, "    \"%s:\\n\"\n", asm_name("__wine_delay_load_asm") );
     switch(target_cpu)
     {
+    case CPU_x86_64:  /* FIXME */
     case CPU_x86:
         fprintf( outfile, "    \"\\tpushl %%ecx\\n\\tpushl %%edx\\n\\tpushl %%eax\\n\"\n" );
         fprintf( outfile, "    \"\\tcall %s\\n\"\n", asm_name("__wine_spec_delay_load") );
@@ -1054,6 +1056,7 @@ static void output_delayed_import_thunks( FILE *outfile, const DLLSPEC *spec )
             fprintf( outfile, "    \".L__wine_delay_imp_%d_%s:\\n\"\n", i, name );
             switch(target_cpu)
             {
+            case CPU_x86_64:  /* FIXME */
             case CPU_x86:
                 fprintf( outfile, "    \"\\tmovl $%d, %%eax\\n\"\n", (idx << 16) | j );
                 fprintf( outfile, "    \"\\tjmp %s\\n\"\n", asm_name("__wine_delay_load_asm") );
diff --git a/tools/winebuild/main.c b/tools/winebuild/main.c
index aaba9194837..8b85266f590 100644
--- a/tools/winebuild/main.c
+++ b/tools/winebuild/main.c
@@ -49,6 +49,8 @@ int kill_at = 0;
 
 #ifdef __i386__
 enum target_cpu target_cpu = CPU_x86;
+#elif defined(__x86_64__)
+enum target_cpu target_cpu = CPU_x86_64;
 #elif defined(__sparc__)
 enum target_cpu target_cpu = CPU_SPARC;
 #elif defined(__ALPHA__)
@@ -109,6 +111,7 @@ static const struct
     { "i586",    CPU_x86 },
     { "i686",    CPU_x86 },
     { "i786",    CPU_x86 },
+    { "x86_64",  CPU_x86_64 },
     { "sparc",   CPU_SPARC },
     { "alpha",   CPU_ALPHA },
     { "powerpc", CPU_POWERPC }
diff --git a/tools/winebuild/spec32.c b/tools/winebuild/spec32.c
index b23d639907a..a5cc915434b 100644
--- a/tools/winebuild/spec32.c
+++ b/tools/winebuild/spec32.c
@@ -375,6 +375,7 @@ void output_dll_init( FILE *outfile, const char *constructor, const char *destru
     else switch(target_cpu)
     {
     case CPU_x86:
+    case CPU_x86_64:
         if (constructor)
         {
             fprintf( outfile, "asm(\"\\t.section\\t\\\".init\\\" ,\\\"ax\\\"\\n\"\n" );
@@ -502,6 +503,7 @@ void BuildSpec32File( FILE *outfile, DLLSPEC *spec )
     switch(target_cpu)
     {
     case CPU_x86:     machine = IMAGE_FILE_MACHINE_I386; break;
+    case CPU_x86_64:  machine = IMAGE_FILE_MACHINE_AMD64; break;
     case CPU_POWERPC: machine = IMAGE_FILE_MACHINE_POWERPC; break;
     case CPU_ALPHA:   machine = IMAGE_FILE_MACHINE_ALPHA; break;
     case CPU_SPARC:   machine = IMAGE_FILE_MACHINE_UNKNOWN; break;
diff --git a/tools/winebuild/utils.c b/tools/winebuild/utils.c
index 19a8c7b4ca1..0b5bc7dbcd7 100644
--- a/tools/winebuild/utils.c
+++ b/tools/winebuild/utils.c
@@ -349,6 +349,7 @@ unsigned int get_alignment(unsigned int align)
     switch(target_cpu)
     {
     case CPU_x86:
+    case CPU_x86_64:
     case CPU_SPARC:
         if (target_platform != PLATFORM_APPLE) return align;
         /* fall through */
@@ -369,6 +370,7 @@ unsigned int get_page_size(void)
     switch(target_cpu)
     {
     case CPU_x86:     return 4096;
+    case CPU_x86_64:  return 4096;
     case CPU_POWERPC: return 4096;
     case CPU_SPARC:   return 8192;
     case CPU_ALPHA:   return 8192;
@@ -378,6 +380,24 @@ unsigned int get_page_size(void)
     return 0;
 }
 
+/* return the size of a pointer on the target CPU */
+unsigned int get_ptr_size(void)
+{
+    switch(target_cpu)
+    {
+    case CPU_x86:
+    case CPU_POWERPC:
+    case CPU_SPARC:
+    case CPU_ALPHA:
+        return 4;
+    case CPU_x86_64:
+        return 8;
+    }
+    /* unreached */
+    assert(0);
+    return 0;
+}
+
 /* return the assembly name for a C symbol */
 const char *asm_name( const char *sym )
 {
@@ -433,6 +453,17 @@ const char *func_size( const char *func )
     }
 }
 
+const char *get_asm_ptr_keyword(void)
+{
+    switch(get_ptr_size())
+    {
+    case 4: return ".long";
+    case 8: return ".quad";
+    }
+    assert(0);
+    return NULL;
+}
+
 const char *get_asm_string_keyword(void)
 {
     switch (target_platform)