diff --git a/acinclude.m4 b/acinclude.m4
index e84c5c785..8e7bb4ae7 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -564,23 +564,6 @@
 }
 ])
 
-# __builtin_alloca is not available everywhere, check it exists before
-# seeing that it works
-GMP_PROG_CC_WORKS_PART_TEST([$1],[__builtin_alloca availability],
-[int k; int foo () { __builtin_alloca (k); }],
-  [GMP_PROG_CC_WORKS_PART([$1], [alloca array],
-[/* The following provokes an internal compiler error from Itanium HP-UX cc
-    under +O2 or higher.  We use this sort of code in mpn/generic/mul_fft.c. */
-int k;
-int foo ()
-{
-  int i, **a;
-  a = __builtin_alloca (k);
-  for (i = 0; i <= k; i++)
-    a[i] = __builtin_alloca (1 << i);
-}
-])])
-
 GMP_PROG_CC_WORKS_PART([$1], [abs int -> double conversion],
 [/* The following provokes an internal error from the assembler on
    power2-ibm-aix4.3.1.0.  gcc -mrios2 compiles to nabs+fcirz, and this
@@ -609,7 +609,7 @@
 
 #if defined (__GNUC__) && ! defined (__cplusplus)
 typedef unsigned long long t1;typedef t1*t2;
-void g(){}
+void g(int,t1 const*,t1,t2,t1 const*,int){}
 void h(){}
 static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
 {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}