diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 955d8849..a917b452 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -292,12 +292,8 @@ AS_IF([test  "x$have_libvhd" = "xyes" ], [
 
 dnl We want pthreads. Try libpthread first, then libc_r (FreeBSD), then PTL.
 HAVE_PTHREADS=yes
-AC_SEARCH_LIBS([pthread_create], [pthread], , [
-  AC_SEARCH_LIBS([pthread_create], [c_r], , [
-    AC_SEARCH_LIBS([pthread_create], [PTL], , [
-      HAVE_PTHREADS=no
-    ])
-  ])
+AC_SEARCH_LIBS([pthread_create], [pthread c_r PTL], , [
+  HAVE_PTHREADS=no
 ])
 if [[ "x$HAVE_PTHREADS" = "xyes" ]]; then
   AC_DEFINE(HAVE_PTHREADS, 1, [Define if pthreads are available.])