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dnl ----------------------------------------
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dnl ---------------------------------------
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AC_CHECK_LIB(png12,png_create_write_struct,,[AC_MSG_ERROR([libpng is required to compile Enigma])])
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AC_CHECK_LIB(png,png_create_write_struct,,[AC_MSG_ERROR([libpng is required to compile Enigma])])
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dnl AC_CHECK_LIB(png12,png_create_write_struct,,[AC_MSG_ERROR([libpng is required to compile Enigma])])
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dnl ----------------------------------------