title: does gtk work under windows 10
body: <p>I have installed MinGW64 (MSYS2) on Windows 10/Surface Pro 2.  Then I installed GTK3 and many other packages with pacman, all the 64 bit versions.  I have even been able to run gtk3-demo and a window pops up.  BUT, I cannot get a simple c program to compile.</p>
  
  <p>program:</p>
  
  <pre><code>#include &lt;gtk/gtk.h&gt;
  
  void on_window_destroy (GtkWidget *widget, gpointer user_data)
  {
      gtk_main_quit ();
       /* quit main loop when windows closes */ 
  }
  
  
  int main (int argc, char *argv[])
  {
      GtkWidget   *window, *label;
  
      gtk_init (&amp;argc,&amp;argv);
       /* initialize GTK+ */
  
  
      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
       /* create the main window */
  
      label = gtk_label_new ("Hello world !");
       /* create a label with sample text */
  
      gtk_container_add (GTK_CONTAINER (window), label);
       /* define the label as window child*/
  
      gtk_widget_show_all (window);
       /* display window and children */
  
  
      g_signal_connect (window, "destroy", G_CALLBACK(on_window_destroy), NULL);
       /* connect the window closing event with the "on_window_destroy" function */
  
      gtk_main ();
       /* MAIN LOOP */
  
      return 0;
  }
  </code></pre>
  
  <p>Which is compiled with all of this from <code>pkg-config --cflags --libs gtk+-3.0</code> and also I had to add  <code>-L /opt/x86_64-w64-mingw32/lib</code> to get pthread to work.</p>
  
  <p>Compile:</p>
  
  <pre><code>gcc test.c -mms-bitfields -pthread -mms-bitfields -I/mingw64/include/gtk-3.0 -I/mingw64/include/cairo -I/mingw64/include -I/mingw64/include/pango-1.0 -I/mingw64/include/atk-1.0 -I/mingw64/include/cairo -I/mingw64/include/pixman-1 -I/mingw64/include -I/mingw64/include/freetype2 -I/mingw64/include/libpng16 -I/mingw64/include/harfbuzz -I/mingw64/include/glib-2.0 -I/mingw64/lib/glib-2.0/include -I/mingw64/include -I/mingw64/include/freetype2 -I/mingw64/include -I/mingw64/include/harfbuzz -I/mingw64/include/libpng16 -I/mingw64/include/gdk-pixbuf-2.0 -I/mingw64/include/libpng16 -I/mingw64/include/glib-2.0 -I/mingw64/lib/glib-2.0/include -L/mingw64/lib -LC:/building/msys64/mingw64/lib -L/mingw64/lib -LC:/building/msys64/mingw64/lib/../lib -L/mingw64/lib -lgtk-3 -lgdk-3 -lgdi32 -limm32 -lshell32 -lole32 -Wl,-luuid -lwinmm -ldwmapi -lz -lepoxy -lpangocairo-1.0 -lpangoft2-1.0 -lpangowin32-1.0 -lgdi32 -lusp10 -lpango-1.0 -lm -latk-1.0 -lcairo-gobject -lcairo -lz -lpixman-1 -lfontconfig -lexpat -lfreetype -liconv -lexpat -lfreetype -lz -lbz2 -lharfbuzz -lpng16 -lz -lgdk_pixbuf-2.0 -lpng16 -lz -lgio-2.0 -lz -lgmodule-2.0 -pthread -lgobject-2.0 -lffi -lglib-2.0 -lintl -pthread -lws2_32 -lole32 -lwinmm -lshlwapi -lintl -L /opt/x86_64-w64-mingw32/lib
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll):(.text+0x0): multiple definition of `_fmode'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-xtxtmode.o):(.bss+0x0): first defined here
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libkernel32.a(KERNEL32.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): string not null terminated in ILF object file.
  c:/program files (x86)/gcc/bin/../lib/gcc/x86_64-w64-mingw32/5.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/opt/x86_64-w64-mingw32/lib/libmsvcrt.a(msvcrt.dll): Recognised but unhandled machine type (0x8664) in Import Library Format archive
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x116): undefined reference to `__getmainargs'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x1dd): undefined reference to `__imp_GetStartupInfoA'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x22d): undefined reference to `__imp_Sleep'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x2ad): undefined reference to `_initterm'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x2da): undefined reference to `_initterm'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.text+0x349): undefined reference to `__imp_SetUnhandledExceptionFilter'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.rdata$.refptr.__imp___initenv[.refptr.__imp___initenv]+0x0): undefined reference to `__imp___initenv'
  C:/Program Files (x86)/gcc/x86_64-w64-mingw32/lib/../lib/crt2.o:crtexe.c:(.rdata$.refptr.__imp__acmdln[.refptr.__imp__acmdln]+0x0): undefined reference to `__imp__acmdln'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-crt_handler.o): In function `__mingw_init_ehandler':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/crt_handler.c:87: undefined reference to `__imp_RtlAddFunctionTable'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-merr.o): In function `_matherr':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/merr.c:72: undefined reference to `fprintf'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-gs_support.o): In function `__security_init_cookie':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:62: undefined reference to `__imp_GetSystemTimeAsFileTime'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:70: undefined reference to `__imp_GetCurrentProcessId'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:74: undefined reference to `__imp_QueryPerformanceCounter'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-gs_support.o): In function `__report_gsfailure':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:111: undefined reference to `__imp_RtlCaptureContext'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:147: undefined reference to `__imp_SetUnhandledExceptionFilter'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:149: undefined reference to `__imp_GetCurrentProcess'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/gs_support.c:150: undefined reference to `abort'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-pseudo-reloc.o): In function `__report_error':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/pseudo-reloc.c:156: undefined reference to `abort'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-atonexit.o): In function `mingw_onexit':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/atonexit.c:43: undefined reference to `_lock'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/atonexit.c:47: undefined reference to `__dllonexit'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/atonexit.c:51: undefined reference to `_unlock'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/atonexit.c:42: undefined reference to `__imp__onexit'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-pesect.o): In function `_FindPESectionByName':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/pesect.c:88: undefined reference to `strncmp'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-tlsthrd.o): In function `__mingw_TLScallback':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/tlsthrd.c:129: undefined reference to `__imp_InitializeCriticalSection'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-tlsthrd.o): In function `__mingwthr_run_key_dtors':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/tlsthrd.c:108: undefined reference to `__imp_TlsGetValue'
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/tlsthrd.c:108: undefined reference to `__imp_TlsGetValue'
  C:/msys64/opt/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-tlsthrd.o): In function `__mingw_TLScallback':
  /msys_scripts/mingw-w64-cross-crt-git/src/mingw-w64/mingw-w64-crt/crt/tlsthrd.c:145: undefined reference to `__imp_DeleteCriticalSection'
  collect2.exe: error: ld returned 1 exit status
  </code></pre>
  
  <p>How do I fix this?</p>
  
  <p>PS, I already had GCC installed before I installed MinGW64.  Perhaps there is some conflict between the old and the new?</p>