Project ERROR: $prefix is undefined. Please pass prefix=<path> to qmake

[lthiet]

Hello,

When I try to qmake then make install

I get this error :

cd src/brdf/ && ( test -e Makefile || /usr/lib/qt5/bin/qmake -o Makefile /path/to/brdf.pro ) && make -f Makefile 
Project ERROR: $prefix is undefined. Please pass prefix=<path> to qmake
Makefile:44: recipe for target 'sub-src-brdf-make_first-ordered' failed
make: *** [sub-src-brdf-make_first-ordered] Error 3

I tried doing this from : https://stackoverflow.com/questions/14639459/how-to-change-qmake-prefix-location :

qmake -set prefix /path/to/repo

But I still get the same error, so I don't know what to do... Please help?

[MayushKumar]

Just do qmake prefix=/path/to/destination/