--- configure
+++ configure
@@ -13084,6 +13084,7 @@
 
 fi
 
+if test "${enable_threads}" != no; then
 SEM_INIT_LIB=''
 ac_fn_c_check_func "$LINENO" "sem_init" "ac_cv_func_sem_init"
 if test "x$ac_cv_func_sem_init" = xyes; then :
@@ -13218,6 +13219,7 @@
 fi
 
 fi
+fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for unified diff option" >&5
 $as_echo_n "checking for unified diff option... " >&6; }