Pthread is now conditionally included in makefile, see ticket #910 (CVS 1974)

FossilOrigin-Name: a35e52276998f8db2407115b07f30bd490982944

configure.ac

@@ -138,7 +138,7 @@ AC_INIT(src/sqlite.h.in)
 dnl Put the RCS revision string after AC_INIT so that it will also
 dnl show in in configure.
 # The following RCS revision string applies to configure.in
-# $Revision: 1.10 $
+# $Revision: 1.11 $
 
 #########
 # Programs needed
@@ -305,6 +305,16 @@ else
 fi
 AC_SUBST(THREADSAFE)
 
+if test "$THREADSAFE" = "1"; then
+  LIBS=""
+  AC_CHECK_LIB(pthread, pthread_create)
+  TARGET_THREAD_LIB="$LIBS"
+  LIBS=""
+else
+  TARGET_THREAD_LIB=""
+fi
+AC_SUBST(TARGET_THREAD_LIB)
+
 ##########
 # Do we want to support release
 #