diff -Naur gcl.orig/o/main.c gcl/o/main.c
--- gcl.orig/o/main.c	2019-09-14 14:33:43.611911750 +0200
+++ gcl/o/main.c	2019-09-14 14:39:56.093532631 +0200
@@ -448,7 +448,7 @@
 	  {
 	    /* make sure the stack is 8 byte aligned */
 	    static double estack_buf[32*SIGSTKSZ];
-	    static struct sigaltstack estack;
+	    static stack_t estack;
 	    
 	    bzero(estack_buf,sizeof(estack_buf));
 	    estack.ss_sp = estack_buf;