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root@linux-virtual-machine:~/qtdir/helloqt# ls
helloqt.pro main.o mainwindow.o moc_mainwindow.cpp
helloqt.pro.user mainwindow.cpp mainwindow.ui moc_mainwindow.o
main.cpp mainwindow.h Makefile ui_mainwindow.h
root@linux-virtual-machine:~/qtdir/helloqt# make
/usr/local/arm/4.3.2/bin/arm-none-linux-gnueabi-g++ -Wl,-O1 -Wl,-rpath,/usr/local/qte/lib -o helloqt main.o mainwindow.o moc_mainwindow.o -L/usr/local/qte/lib -lQtGui -L/usr/local/qte/lib -lQtNetwork -lQtCore -lpthread
/usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld: warning: libpng.so.3, needed by /usr/local/qte/lib/libQtGui.so, not found (try using -rpath or -rpath-link)
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_valid'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_error_fn'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_create_info_struct'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_expand'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_read_info'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_write_info'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_strip_16'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_io_ptr'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_read_fn'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_write_image'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_destroy_read_struct'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_filler'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_IHDR'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_destroy_write_struct'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_oFFs'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_text'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_create_read_struct'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_sig_bytes'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_channels'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_tRNS'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_bgr'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_packing'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_sBIT'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_image_height'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_IHDR'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_gAMA'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_compression_level'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_gray_to_rgb'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_tRNS'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_write_fn'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_x_pixels_per_meter'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_write_end'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_write_chunk'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_image_width'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_y_pixels_per_meter'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_read_end'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_packswap'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_PLTE'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_read_image'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_create_write_struct'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_error'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_pHYs'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_read_update_info'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_gamma'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_invert_mono'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_set_PLTE'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_text'
/usr/local/qte/lib/libQtGui.so: undefined reference to `png_get_gAMA'
collect2: ld returned 1 exit status
make: *** [helloqt] Error 1
root@linux-virtual-machine:~/qtdir/helloqt#
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