Quote error message.

lib/xmalloc.c

@@ -47,11 +47,11 @@ void free ();
 #endif
 
 #ifndef HAVE_DONE_WORKING_MALLOC_CHECK
-you must run the autoconf test for a properly working malloc -- see malloc.m4
+"you must run the autoconf test for a properly working malloc -- see malloc.m4"
 #endif
 
 #ifndef HAVE_DONE_WORKING_REALLOC_CHECK
-you must run the autoconf test for a properly working realloc -- see realloc.m4
+"you must run the autoconf test for a properly working realloc --see realloc.m4"
 #endif
 
 /* Exit value when the requested amount of memory is not available.