I just did a test using jsoncpp-1.7.7 from the releases section of the github site - albeit using corepure64 rather than Pi: [code]$ mkdir build
$ cd build
$ cmake -DCMAKE_C_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS="-mtune=generic -Os -pipe" ...
$ cd build
$ cmake -DCMAKE_C_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS="-mtune=generic -Os -pipe" ...