Fix pthread linking errors

PKGBUILD

@@ -8,7 +8,7 @@ pkgver=1.3.6 #Should match `grep "PACKAGE_VERSION" ccnet/Makefile`
 _seafilever=2.0.5
 
 #The release number for the arch package, as fixes are added to the PKGBUILD, the release number will increase
-pkgrel=1
+pkgrel=2
 
 # The description of the package, should be about 80 characters long (one line)
 pkgdesc="A framework for writing networked applications in C."
@@ -52,7 +52,7 @@ prepare () {
 build () {
 	cd "$srcdir/ccnet-$_seafilever"
 	./autogen.sh
-	./configure --enable-server --prefix=/usr PYTHON=/usr/bin/python2
+	CFLAGS="-lpthread" ./configure --enable-server --prefix=/usr PYTHON=/usr/bin/python2
 	make -j1
 }