diff --git a/Makefile.am b/Makefile.am
index e1e1ec8..12485da 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+ACLOCAL_AMFLAGS = -I .
+
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = pthread-stubs.pc
 
diff --git a/check-stub.m4 b/check-stub.m4
new file mode 100644
index 0000000..9478b42
--- /dev/null
+++ b/check-stub.m4
@@ -0,0 +1,24 @@
+# CHECK_PTHREAD_STUB(PTHREAD-FUNC,TRYLINK-FUNC-BODY,[ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+AC_DEFUN([CHECK_PTHREAD_STUB],
+	 [_CHECK_STUB([$1],[#include <pthread.h>],m4_shift($@))])
+
+# CHECK_SEM_STUB(SEM-FUNC,TRYLINK-FUNC-BODY,[ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+AC_DEFUN([CHECK_SEM_STUB],
+	 [_CHECK_STUB([$1],[#include <semaphore.h>],m4_shift($@))])
+
+# CHECK_STUB(FUNC,TRYLINK-INCLUDES,TRYLINK-FUNC-BODY,[ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+AC_DEFUN([_CHECK_STUB],
+[dnl
+AH_TEMPLATE(AS_TR_CPP([HAVE_$1]), [Define to 1 if you have the `$1' function.])
+dnl
+AC_CACHE_CHECK([for $1], [ac_cv_func_$1],
+	       [AC_TRY_LINK([$2], [$3],
+			    [ac_cv_func_$1=yes],
+			    [ac_cv_func_$1=no])])
+if test "x$ac_cv_func_$1" = "xyes"; then
+AC_DEFINE(AS_TR_CPP([HAVE_$1]))
+m4_default([$4], [:])
+else
+m4_default([$5], [:])
+fi
+])
diff --git a/configure.ac b/configure.ac
index ffccea9..4568d01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,11 +30,78 @@ if test "x$cc_cv_attribute_alias" = "xyes"; then
 fi
 
 
-PKG_CONFIG_LIBS=
-AC_CHECK_FUNCS([pthread_self pthread_mutex_init pthread_mutex_destroy pthread_mutex_lock pthread_mutex_unlock pthread_cond_init pthread_cond_destroy pthread_cond_wait pthread_cond_signal pthread_cond_broadcast pthread_equal sem_init sem_destroy sem_wait sem_trywait],
-	       [], [PKG_CONFIG_LIBS='-L${libdir} -lpthread-stubs'])
+lack_stubs=
+
+
+CHECK_PTHREAD_STUB([pthread_self],
+		   [(void)pthread_self();],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_equal],
+		   [pthread_t t1,t2; (void)pthread_equal(t1,t2);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_mutex_init],
+		   [pthread_mutex_t m; (void)pthread_mutex_init(&m,(void*)0);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_mutex_destroy],
+		   [pthread_mutex_t m; (void)pthread_mutex_destroy(&m);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_mutex_lock],
+		   [pthread_mutex_t m; (void)pthread_mutex_lock(&m);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_mutex_unlock],
+		   [pthread_mutex_t m; (void)pthread_mutex_unlock(&m);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_cond_init],
+		   [pthread_cond_t c; (void)pthread_cond_init(&c,(void*)0);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_cond_destroy],
+		   [pthread_cond_t c; (void)pthread_cond_destroy(&c);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_cond_wait],
+		   [pthread_cond_t c; pthread_mutex_t m; (void)pthread_cond_wait(&c,&m);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_cond_signal],
+		   [pthread_cond_t c; (void)pthread_cond_signal(&c);],
+		   [], [lack_stubs=yes])
+
+CHECK_PTHREAD_STUB([pthread_cond_broadcast],
+		   [pthread_cond_t c; (void)pthread_cond_broadcast(&c);],
+		   [], [lack_stubs=yes])
+
+
+CHECK_SEM_STUB([sem_init],
+	       [sem_t s; (void)sem_init(&s,0,0);],
+	       [], [lack_stubs=yes])
+
+CHECK_SEM_STUB([sem_destory],
+	       [sem_t s; (void)sem_destory(&s);],
+	       [], [lack_stubs=yes])
+
+CHECK_SEM_STUB([sem_wait],
+	       [sem_t s; (void)sem_wait(&s);],
+	       [], [lack_stubs=yes])
+
+CHECK_SEM_STUB([sem_trywait],
+	       [sem_t s; (void)sem_trywait(&s);],
+	       [], [lack_stubs=yes])
+
+
+if test "x$lack_stubs" = "xyes"; then
+  PKG_CONFIG_LIBS='-L${libdir} -lpthread-stubs'
+else
+  PKG_CONFIG_LIBS=''
+fi
 AC_SUBST([PKG_CONFIG_LIBS])
-AM_CONDITIONAL(BUILD_LIB, test "x$PKG_CONFIG_LIBS" != x)
+AM_CONDITIONAL(BUILD_LIB, test "x$lack_stubs" = "xyes")
 
 AC_CONFIG_FILES([Makefile pthread-stubs.pc])
 AC_OUTPUT