updated file io test to avoid crash

build/make.linux64.test.py

@@ -17,7 +17,7 @@ builddir = "./build_linux64"
 doinstall = True   #copies the build_output to the install dir when finished
 cc = "g++" #compiler
 cflags = "-fPIC"
-libraries = "-l{}".format(libname)
+libraries = "-l{} -lpthread".format(libname)
 libdirs = "-L{} -L{}/lib -L{}/lib".format(builddir,commondir,depdir)
 linkerflags = "-static -static-libgcc -Wl,-rpath=."
 srcexts = [".c",".cpp"]