diff --git a/compiler/pdecsub.pas b/compiler/pdecsub.pas
index 74f94b91ad..b1a15bbd4f 100644
--- a/compiler/pdecsub.pas
+++ b/compiler/pdecsub.pas
@@ -1802,13 +1802,13 @@ end;
 
 
 procedure pd_syscall(pd:tabstractprocdef);
-{$if defined(powerpc) or defined(m68k) or defined(i386)}
+{$if defined(powerpc) or defined(m68k) or defined(i386) or defined(x86_64)}
 var
   vs  : tparavarsym;
   sym : tsym;
   symtable : TSymtable;
   v: Tconstexprint;
-{$endif defined(powerpc) or defined(m68k) or defined(i386)}
+{$endif defined(powerpc) or defined(m68k) or defined(i386) or defined(x86_64)}
 begin
   if (pd.typ<>procdef) and (target_info.system <> system_powerpc_amiga) then
     internalerror(2003042614);
@@ -1973,8 +1973,8 @@ begin
         Tprocdef(pd).extnumber:=v.uvalue;
     end;
 {$endif powerpc}
-{$ifdef i386}
-   if target_info.system = system_i386_aros then
+{$if defined(i386) or defined(x86_64)}
+   if target_info.system in [system_i386_aros,system_x86_64_aros] then
     begin
       include(pd.procoptions,po_syscall_sysvbase);
 
@@ -2002,7 +2002,7 @@ begin
       if (v<low(Tprocdef(pd).extnumber)) or (v>high(Tprocdef(pd).extnumber)) then
         message(parser_e_range_check_error)
       else
-        Tprocdef(pd).extnumber:=v.uvalue * 4; { sizeof Pointer for the target }
+        Tprocdef(pd).extnumber:=v.uvalue * sizeof(pint);
     end;
 {$endif}
 end;
diff --git a/compiler/x86/agx86att.pas b/compiler/x86/agx86att.pas
index 16b58efd61..c9bd2e3fa4 100644
--- a/compiler/x86/agx86att.pas
+++ b/compiler/x86/agx86att.pas
@@ -471,7 +471,7 @@ interface
             supported_targets : [system_x86_64_linux,system_x86_64_freebsd,
                                  system_x86_64_win64,system_x86_64_embedded,
                                  system_x86_64_openbsd,system_x86_64_netbsd,
-                                 system_x86_64_dragonfly];
+                                 system_x86_64_dragonfly,system_x86_64_aros];
             flags : [af_needar,af_smartlink_sections,af_supports_dwarf];
             labelprefix : '.L';
             comment : '# ';
diff --git a/compiler/x86_64/cpuelf.pas b/compiler/x86_64/cpuelf.pas
index 9a3d8d87b6..a5e4a45fd9 100644
--- a/compiler/x86_64/cpuelf.pas
+++ b/compiler/x86_64/cpuelf.pas
@@ -676,7 +676,8 @@ implementation
         asmcmd : '';
         supported_targets : [system_x86_64_linux,system_x86_64_freebsd,
                              system_x86_64_openbsd,system_x86_64_netbsd,
-                             system_x86_64_dragonfly,system_x86_64_solaris];
+                             system_x86_64_dragonfly,system_x86_64_solaris,
+                             system_x86_64_aros];
         flags : [af_outputbinary,af_smartlink_sections,af_supports_dwarf];
         labelprefix : '.L';
         comment : '';
diff --git a/compiler/x86_64/cputarg.pas b/compiler/x86_64/cputarg.pas
index b979a31ccb..7da0846918 100644
--- a/compiler/x86_64/cputarg.pas
+++ b/compiler/x86_64/cputarg.pas
@@ -49,6 +49,10 @@ implementation
     {$ifndef NOTARGETSUNOS}
       ,t_sunos
     {$endif}
+    {$ifndef NOTARGETAROS}
+      ,t_aros
+    {$endif}
+
 
 {**************************************
              Assemblers
diff --git a/compiler/x86_64/nx64cal.pas b/compiler/x86_64/nx64cal.pas
index b97b1699bb..c5cd1eb998 100644
--- a/compiler/x86_64/nx64cal.pas
+++ b/compiler/x86_64/nx64cal.pas
@@ -31,9 +31,12 @@ interface
 
     type
        tx8664callnode = class(tx86callnode)
-        protected
+       protected
+         procedure gen_syscall_para(para: tcallparanode); override;
          procedure extra_call_code;override;
          procedure set_result_location(realresdef: tstoreddef);override;
+       public
+         procedure do_syscall;override;
        end;
 
 
@@ -41,10 +44,53 @@ implementation
 
     uses
       globtype,
-      systems,
+      systems,verbose,cutils,
       cpubase,cgbase,cgutils,cgobj,
+      symsym,symcpu,nld,
       aasmtai,aasmdata,aasmcpu;
 
+{    uses
+      globtype,systems,
+      cutils,verbose,globals,
+      cgbase,cgutils,
+      cpubase,paramgr,
+      aasmtai,aasmdata,aasmcpu,
+      nbas,nmem,nld,ncnv,
+      symdef,symsym,symcpu,
+      cga,cgobj,cpuinfo;}
+
+
+    procedure tx8664callnode.do_syscall;
+      var
+        tmpref: treference;
+      begin
+        case target_info.system of
+          system_x86_64_aros:
+            begin
+              // one syscall convention for AROS
+              current_asmdata.CurrAsmList.concat(tai_comment.create(strpnew('AROS SysCall')));
+              reference_reset(tmpref,sizeof(pint));
+              tmpref.symbol:=current_asmdata.RefAsmSymbol(tstaticvarsym(tcpuprocdef(procdefinition).libsym).mangledname);
+              cg.getcpuregister(current_asmdata.CurrAsmList,NR_RAX);
+              cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,tmpref,NR_RAX);
+              reference_reset_base(tmpref,NR_EAX,-tprocdef(procdefinition).extnumber,sizeof(pint));
+              cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,tmpref,NR_RAX);
+              cg.a_call_reg(current_asmdata.CurrAsmList,NR_RAX);
+              cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_RAX);
+            end;
+          else
+            internalerror(2015062801);
+        end;
+      end;
+
+
+    procedure tx8664callnode.gen_syscall_para(para: tcallparanode);
+      begin
+        { lib parameter has no special type but proccalloptions must be a syscall }
+        para.left:=cloadnode.create(tcpuprocdef(procdefinition).libsym,tcpuprocdef(procdefinition).libsym.owner);
+      end;
+
+
     procedure tx8664callnode.extra_call_code;
       var
         mmregs : aint;
diff --git a/compiler/x86_64/symcpu.pas b/compiler/x86_64/symcpu.pas
index 09466d6be4..038726deef 100644
--- a/compiler/x86_64/symcpu.pas
+++ b/compiler/x86_64/symcpu.pas
@@ -26,7 +26,7 @@ unit symcpu;
 interface
 
 uses
-  symtype,symdef,symsym,symx86;
+  symconst,symtype,symdef,symsym,symx86;
 
 type
   { defs }
@@ -91,6 +91,15 @@ type
   tcpuprocvardefclass = class of tcpuprocvardef;
 
   tcpuprocdef = class(tprocdef)
+    procedure ppuload_platform(ppufile: tcompilerppufile); override;
+    procedure ppuwrite_platform(ppufile: tcompilerppufile); override;
+   public
+    { library symbol for AROS }
+    libsym : tsym;
+    libsymderef : tderef;
+    function getcopyas(newtyp: tdeftyp; copytyp: tproccopytyp): tstoreddef; override;
+    procedure buildderef; override;
+    procedure deref; override;
   end;
   tcpuprocdefclass = class of tcpuprocdef;
 
@@ -174,6 +183,52 @@ const
 
 implementation
 
+{****************************************************************************
+                             tcpuprocdef
+****************************************************************************}
+
+  procedure tcpuprocdef.ppuload_platform(ppufile: tcompilerppufile);
+    begin
+      inherited;
+      if po_syscall_has_libsym in procoptions then
+        ppufile.getderef(libsymderef);
+    end;
+
+
+  procedure tcpuprocdef.ppuwrite_platform(ppufile: tcompilerppufile);
+    begin
+      inherited;
+      if po_syscall_has_libsym in procoptions then
+        ppufile.putderef(libsymderef);
+    end;
+
+
+  function tcpuprocdef.getcopyas(newtyp: tdeftyp; copytyp: tproccopytyp): tstoreddef;
+    begin
+      result:=inherited;
+      if newtyp=procdef then
+        tcpuprocdef(result).libsym:=libsym;
+    end;
+
+
+  procedure tcpuprocdef.buildderef;
+    begin
+      inherited;
+      if po_syscall_has_libsym in procoptions then
+        libsymderef.build(libsym);
+    end;
+
+
+  procedure tcpuprocdef.deref;
+    begin
+      inherited;
+      if po_syscall_has_libsym in procoptions then
+        libsym:=tsym(libsymderef.resolve)
+      else
+        libsym:=nil;
+    end;
+
+
 begin
   { used tdef classes }
   cfiledef:=tcpufiledef;