--- pHash-0.9.6/src/Makefile.am.link	2015-11-09 19:45:06.853969444 +0100
+++ pHash-0.9.6/src/Makefile.am	2015-11-09 19:45:28.471019230 +0100
@@ -1,6 +1,7 @@
 lib_LTLIBRARIES = libpHash.la
 libpHash_la_SOURCES = pHash.cpp
 libpHash_la_LDFLAGS = -no-undefined
+libpHash_la_LIBADD = -lpthread
 include_HEADERS = pHash.h
 
 if HAVE_AUDIO_HASH