FindICU.cmake not finding static libraries
Using CMake 3.7.2 and the MinGW environment (http://mxe.cc/) targeting a x86_64-w64-mingw32.static build, I discovered that FindICU.cmake reports the requested components as "not found" despite them quite clearly being there.
After some looking-into-the-code, it seems that ICU and CMake's FindICU.cmake disagree on the naming of statically linked libraries. ICU prefixes them with an "s" (i.e., libsicuin.a instead of libicuin.dll), and apparently FindICU.cmake does not take this into account.