Index: usr.bin/grep/grep.c
===================================================================
--- usr.bin/grep/grep.c
+++ usr.bin/grep/grep.c
@@ -704,8 +704,13 @@
 	case GREP_BASIC:
 		break;
 	case GREP_FIXED:
-		/* XXX: header mess, REG_LITERAL not defined in gnu/regex.h */
-		cflags |= 0020;
+#ifdef REG_NOSPEC
+		cflags |= REG_NOSPEC;
+#elif DEFINED(REG_LITERAL)
+		cflags |= REG_LITERAL;
+#else
+		err(2, "literal expressions not supported at compile-time");
+#endif
 		break;
 	case GREP_EXTENDED:
 		cflags |= REG_EXTENDED;