Some parameters (like "${PROJECT_SOURCE_DIR}/cmake/modules" and "${CMAKE_CURRENT_BINARY_DIR}/usbproxy.pc") are passed to CMake commands in your build scripts without enclosing them by quotation marks. I see that these places will result in build difficulties if the contents of the used variables will contain special characters like semicolons.
Some parameters (like "${PROJECT_SOURCE_DIR}/cmake/modules" and "${CMAKE_CURRENT_BINARY_DIR}/usbproxy.pc") are passed to CMake commands in your build scripts without enclosing them by quotation marks. I see that these places will result in build difficulties if the contents of the used variables will contain special characters like semicolons.
I would recommend to apply advices from a wiki article.