Follow to qwt_valuelist.h and change this:

Qt Code:
  1. #if QT_VERSION < 0x040300
  2. // Some compilers have problems,
  3. // without a qHash(double) implementation
  4. #include <qset.h>
  5. #include <qvector.h>
  6. inline uint qHash(double key) { return uint(key); }
  7. #endif
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to:

Qt Code:
  1. #if QT_VERSION == 0x040600
  2. // Some compilers have problems,
  3. // without a qHash(double) implementation
  4. #include <qset.h>
  5. #include <qvector.h>
  6. inline uint qHash(double key) { return uint(key); }
  7. #endif
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