diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 52061777..653ee0df 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -292,9 +292,9 @@ AS_IF([test  "x$have_libvhd" = "xyes" ], [
 
 dnl We want pthreads. Try libpthread first, then libc_r (FreeBSD), then PTL.
 HAVE_PTHREADS=yes
-AC_CHECK_LIB(pthread, pthread_create, , [
-  AC_CHECK_LIB(c_r, pthread_create, , [
-    AC_CHECK_LIB(PTL, pthread_create, , [
+AC_SEARCH_LIBS(pthread_create, pthread, , [
+  AC_SEARCH_LIBS(pthread_create, c_r, , [
+    AC_SEARCH_LIBS(pthread_create, PTL, , [
       HAVE_PTHREADS=no
     ])
   ])