--- as/driver.c
+++ as/driver.c
@@ -28,6 +28,9 @@
 char **envp)
 {
     const char *LIB =
+#ifdef ASLIBEXECDIR
+      ASLIBEXECDIR;
+#else
 #if defined(__OPENSTEP__) || defined(__HERA__) || \
     defined(__GONZO_BUNSEN_BEAKER__) || defined(__KODIAK__)
 		    "../libexec/";
@@ -41,6 +44,7 @@
 #else
 		    "../local/libexec/gcc/darwin/";
 #endif
+#endif
     const char *AS = "/as";
     const char *LLVM_MC = "llvm-mc";
 
@@ -240,7 +244,11 @@
 
 	}
 
+#ifndef ASLIBEXECDIR
 	as = makestr(prefix, LIB, arch_name, AS, NULL);
+#else
+	as = makestr(LIB, arch_name, AS, NULL);
+#endif
 
 	/*
 	 * If this assembler exist try to run it else print an error message.
@@ -252,6 +260,10 @@
 	    else
 		exit(1);
 	}
+#ifdef ASLIBEXECDIR
+    as_local = "";
+	{
+#else
 	as_local = makestr(prefix, LOCALLIB, arch_name, AS, NULL);
 	if(access(as_local, F_OK) == 0){
 	    argv[0] = as_local;
@@ -261,6 +273,7 @@
 		exit(1);
 	}
 	else{
+#endif
 	    printf("%s: assembler (%s or %s) for architecture %s not "
 		   "installed\n", progname, as, as_local, arch_name);
 	    arch_flags = get_arch_flags();
@@ -273,6 +286,7 @@
 		    printf("%s for architecture %s\n", as, arch_flags[i].name);
 		    count++;
 		}
+#ifndef ASLIBEXECDIR
 		else{
 		    as_local = makestr(prefix, LOCALLIB, arch_flags[i].name,
 				       AS, NULL);
@@ -284,6 +298,7 @@
 			count++;
 		    }
 		}
+#endif
 	    }
 	    if(count == 0)
 		printf("%s: no assemblers installed\n", progname);