Added NO_SHARED flag to disable generating the shared library.

Makefile

@@ -80,6 +80,7 @@ endif
 	@echo
 
 shared :
+ifndef NO_SHARED
 ifeq ($(OSNAME), Linux)
 	$(MAKE) -C exports so
 	-ln -fs $(LIBSONAME) $(LIBPREFIX).so
@@ -103,6 +104,7 @@ endif
 ifeq ($(OSNAME), CYGWIN_NT)
 	$(MAKE) -C exports dll
 endif
+endif
 
 tests :
 ifndef NOFORTRAN

Makefile.rule

@@ -45,6 +45,9 @@ VERSION = 0.2.4
 # automatically detected by the the script.
 # NUM_THREADS = 24
 
+# if you don't need generate the shared library, please comment it in.
+# NO_SHARED = 1
+
 # If you don't need CBLAS interface, please comment it in.
 # NO_CBLAS = 1