Use nowide from Boost. From Fedora.

Index: nowide/CMakeLists.txt
--- nowide/CMakeLists.txt.orig
+++ nowide/CMakeLists.txt
@@ -1,7 +1,5 @@
 find_package(Boost 1.54 REQUIRED)
 
-add_leatherman_includes(${Boost_INCLUDE_DIRS} "${CMAKE_CURRENT_SOURCE_DIR}/../vendor/nowide/include")
-add_leatherman_headers(../vendor/nowide/include/boost)
 if(WIN32)
     add_leatherman_library(../vendor/nowide/src/iostream.cpp)
 endif()
