patch 8.1.0991: cannot build with a mix of features commit https://github.com/vim/vim/commit/975880b6e6de473b512995ef87ce072aaca934cf Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 3 14:42:11 2019 +0100 patch 8.1.0991: cannot build with a mix of features Problem: Cannot build with FEAT_EVAL defined and FEAT_SEARCH_EXTRA undefined, and with FEAT_DIFF defined and FEAT_EVAL undefined. Solution: Add a couple of #ifdefs. (closes #4067)

--- a/src/diff.c
+++ b/src/diff.c
@@ -866,7 +866,11 @@ theend:
     int
 diff_internal(void)
 {
-    return (diff_flags & DIFF_INTERNAL) != 0 && *p_dex == NUL;
+    return (diff_flags & DIFF_INTERNAL) != 0
+#ifdef FEAT_EVAL
+	&& *p_dex == NUL
+#endif
+	;
 }
 
 /*