osm2pgrouting build doesn't seem to respect -DCMAKE_INSTALL_PREFIX (at least not on mingw64)

[robe2]

I'm trying to build osm2pgrouting under Mingw64 and it compiles okay, however it seems to insist on installing the binaries in /usr/share/osm2pgrouting

My CMAKE looks something like this: the placeholders of variables are just so I can compile for different versions of things so ignore those -- but the DCMAKE_INSTALL_PREFIX seems to be ignored. I've used the same to build sfcgal and geos for example and that setting works fine on those.

cmake -G "MSYS Makefiles" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_PREFIX:PATH=${PROJECTS}/pgrouting/rel-osm2pgrouting-${PGROUTING_VER}w${OS_BUILD}${GCC_TYPE} -DBOOST_ROOT:PATH=${PROJECTS}/boost/rel-${BOOST_VER_WU}w${OS_BUILD}${GCC_TYPE} -DEXPAT_INCLUDE_DIR:PATH=${PROJECTS}/expat/rel-expat-${EXPAT_VER}w${OS_BUILD}${GCC_TYPE}/include -DEXPAT_LIBRARY:PATH=${PROJECTS}/expat/rel-expat-${EXPAT_VER}w${OS_BUILD}${GCC_TYPE}/bin/libexpat-1.dll -DBoost_USE_STATIC_LIBS=ON -DBoost_USE_MULTITHREADED=ON ../branches/osm2pgrouting${PGROUTING_VER}