else()
set(INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/Install" CACHE PATH "The path where to install")
endif()
-set(CMAKE_INSTALL_PREFIX ${INSTALL_PREFIX} CACHE STRING "Installation Prefix" FORCE)
+set(CMAKE_INSTALL_PREFIX ${INSTALL_PREFIX} CACHE STRING "Installation Prefix")
# (BUG!!!) as PKG_CONFIG_PATH does not work [should be en env variable]
set(PKG_CONFIG_USE_CMAKE_PREFIX_PATH ON CACHE BOOLEAN "Flag for using prefix path")