https://github.com/aguinet/usbtop/pull/15

--- src/CMakeLists.txt.orig	2017-12-17 21:14:26 UTC
+++ src/CMakeLists.txt
@@ -21,5 +21,9 @@ usb_stats.cpp
 
 add_executable(usbtop ${SRC_FILES})
 target_link_libraries(usbtop ${PCAP_LIBRARIES} ${Boost_LIBRARIES})
+if(UNIX AND NOT APPLE)
+	# Boost.Thread 1.67+ headers reference pthread_condattr_*
+	target_link_libraries(usbtop pthread)
+endif()
 
 install(TARGETS usbtop DESTINATION sbin)