--- clisp-2.35/src/spvw.d.orig	2005-08-18 18:56:55.000000000 +0200
+++ clisp-2.35/src/spvw.d	2005-10-10 13:25:37.000000000 +0200
@@ -2671,6 +2671,10 @@
       # Don't use more than 36 address bits, otherwise mmap() fails.
       part &= 0x0000000FFFFFFFFFUL;
       #endif
+      #if defined(DECALPHA) && defined(UNIX_LINUX)
+      # Don't use more than 40 address bits, otherwise mmap() fails.
+      part &= 0x000000FFFFFFFFFFUL;
+      #endif
       mem.heaps[0].heap_limit = start + round_down(1*part,map_pagesize);
       mem.heaps[1].heap_limit = start + round_down(4*part,map_pagesize);
       #endif
@@ -2713,6 +2717,10 @@
       # Don't use more than 36 address bits, otherwise mmap() fails.
       part &= 0x0000000FFFFFFFFFUL;
       #endif
+      #if defined(DECALPHA) && defined(UNIX_LINUX)
+      # Don't use more than 40 address bits, otherwise mmap() fails.
+      part &= 0x000000FFFFFFFFFFUL;
+      #endif
       mem.heaps[0].heap_limit = start + round_down(1*part,map_pagesize);
       mem.heaps[0].heap_hardlimit =
         mem.heaps[1].heap_limit = start + round_down(2*part,map_pagesize);
--- clisp-2.49/src/lispbibl.d.orig	2012-12-13 18:49:18.149361417 +0100
+++ clisp-2.49/src/lispbibl.d	2012-12-13 18:56:22.232685912 +0100
@@ -2979,7 +2979,7 @@
 #endif
 
 
-#if (oint_addr_shift == 0) && (addr_shift == 0) && defined(TYPECODES) && !defined(WIDE_SOFT) && !(defined(AMD64) && defined(UNIX_LINUX))
+#if (oint_addr_shift == 0) && (addr_shift == 0) && defined(TYPECODES) && !defined(WIDE_SOFT) && !(defined(AMD64) && defined(UNIX_LINUX)) && !(defined(DECALPHA) && defined(UNIX_LINUX))
 /* If the address bits are the lower ones and not WIDE_SOFT,
  memory mapping may be possible. */