--- integration/test.c.orig
+++ integration/test.c
@@ -1754,7 +1754,11 @@ int main (void)
         gsl_test_rel(w->rlist[i],r[i],1e-14,"qawc(f459) rlist") ;
 
     for (i = 0; i < 6 ; i++) 
+#ifdef __i386__		/* x86 extra FPU precision hurts us here */
         gsl_test_rel(w->elist[i],e[i],1e-4,"qawc(f459) elist") ;
+#else
+	gsl_test_rel(w->elist[i],e[i],1e-5,"qawc(f459) elist") ;
+#endif
 
     for (i = 0; i < 6 ; i++) 
         gsl_test_int((int)w->order[i],order[i]-1,"qawc(f459) order");
--- configure.ac.orig
+++ configure.ac
@@ -87,7 +87,9 @@ AC_CANONICAL_HOST
 
 dnl Checks for programs.
 AC_LANG(C)
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
 AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_LN_S