touchReadXY is defined both in arm7 and arm9. Maybe you missed some steps in the head part of your code:
[pascal]
program main9;
{$apptype arm9}
{$define ARM9}
{$mode objfpc}
uses
ctypes;
{$include nds.inc}
begin
// Your code for ARM9 here
end.
[/pascal]
[pascal]
program main7;
{$apptype arm7}
{$define ARM7}
{$mode objfpc}
uses
ctypes;
{$include nds.inc}
begin
// Your code for ARM7 here
end.
[/pascal]
Without these defines, the compiler can't compile your code correctly, nor libnds will be linked in the right way.
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