/usr/ports/net/wdt/work/wdt-1.27.1612021-190-g6a122f2/../folly/folly/Conv.h not found

[yurivict]

CMake Error at CMakeLists.txt:58 (MESSAGE):
  
  /usr/ports/net/wdt/work/wdt-1.27.1612021-190-g6a122f2/../folly/folly/Conv.h
  not found

    Fix using:
    (in a sister directory of the wdt source tree - same level:)
    git clone https://github.com/facebook/folly.git
    or change FOLLY_SOURCE_DIR (use ccmake or -DFOLLY_SOURCE_DIR=...)
    or change WDT_USE_SYSTEM_FOLLY (use ccmake or -DWDT_USE_SYSTEM_FOLLY=...)

folly is installed into /usr/local, and using external package should be the default mode.