another ubuntu 20 install instruction

diff --git a/INSTALL b/INSTALL
index e0c1787d026cfd73c6c9a1096f2bc99a8875dcc0..75000229eb0a44e63b1b6c8d928a585e0f7c4d68 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -42,8 +42,13 @@ Type this as normal user:
 
 *** Troubleshooting:
 
-- on ubuntu 20, I receive a failure on mkmf-gnome2 lib loading indicating missing
-  mkmf-gnome; "sudo gem install gtk3" workarounds this problem
+- on ubuntu 20, I received a failure on mkmf-gnome2 lib loading
+  indicating missing mkmf-gnome, and "sudo gem install gtk3"
+  workarounded this problem
+
+- on one ubuntu 20, I received a failure compiling the extension with
+  Exiv2::AnyError not found; adding "#include <exiv2/exif.hpp>" in
+  line 27 of ext/rbbooh.cc workarounded this problem
 
 - if that fails on missing GTK header file (gtk.h), you can try to
   inject cflags with such a command: