--- gforth/configure.in	2008/08/19 13:59:00	1.241
+++ gforth/configure.in	2008/08/19 18:57:19	1.242
@@ -856,7 +856,7 @@ AC_CHECK_FUNCS(expm1 log1p)
 AC_REPLACE_FUNCS(rint ecvt)
 dnl No check for select, because our replacement is no good under
 dnl anything but DOS
-AC_CHECK_HEADERS(sys/mman.h fnmatch.h)
+AC_CHECK_HEADERS(sys/mman.h fnmatch.h alloca.h)
 AC_FUNC_FNMATCH
 test $ac_cv_func_fnmatch_works = yes || AC_LIBOBJ(fnmatch)
 AC_CHECK_FUNCS(mmap sysconf getpagesize)