Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -973,10 +973,27 @@
 # symbols that do not begin with "sqlite3_". It is run as part of the
 # releasetest.tcl script.
 #
 checksymbols: sqlite3.o
 	nm -g --defined-only sqlite3.o | grep -v " sqlite3_" ; test $$? -ne 0
+
+# The next two rules are used to support the "threadtest" target. Building
+# threadtest runs a few thread-safety tests that are implemented in C. This
+# target is invoked by the releasetest.tcl script.
+# 
+THREADTEST3_SRC = $(TOP)/test/threadtest3.c    \
+                  $(TOP)/test/tt3_checkpoint.c \
+                  $(TOP)/test/tt3_index.c      \
+                  $(TOP)/test/tt3_vacuum.c      \
+                  $(TOP)/test/tt3_stress.c      \
+                  $(TOP)/test/tt3_lookaside1.c
+
+threadtest3$(TEXE): sqlite3.o $(THREADTEST3_SRC)
+	$(LTLINK) $(TOP)/test/threadtest3.c sqlite3.o -o $@ $(TLIBS)
+
+threadtest: threadtest3$(TEXE)
+	./threadtest3$(TEXE)
 
 # Standard install and cleanup targets
 #
 lib_install:	libsqlite3.la
 	$(INSTALL) -d $(DESTDIR)$(libdir)

Index: test/releasetest.tcl
==================================================================
--- test/releasetest.tcl
+++ test/releasetest.tcl
@@ -267,11 +267,11 @@
 proc configureCommand {} {
   set result [list dryrun exec]
   if {$::tcl_platform(platform)=="windows"} {
     lappend result sh
   }
-  lappend result $::SRCDIR/configure >& test.log
+  lappend result $::SRCDIR/configure -enable-load-extension >& test.log
 }
 
 # The following procedure returns the "make" command to be executed for the
 # specified targets, compiler flags, and options.
 #