Qwt 6.1, Qt 5.1 on Mac OS X

[mrdebug]

I have a problem with qwt 6.1 on Mac OS X. I have compiled qwt without any problem in this mode:

qmake qwt.pro
make
make install

but when I try to execute a program that uses qwt I obtain the error: "Incompatible library version: Program01 requires version 6.1.0 or later but qwt provides version 6.0.0"
I have only the version 6.1.0 installed in my machine.
On Windows and Linux all works well. Is a bug of qwt?