Put \ifx guards on most other package includes, too.

[mjotex.git] / mjo-listing.tex

diff --git a/mjo-listing.tex b/mjo-listing.tex
index f898aba13ea886be03258fea0bfc61dd1ee72dd9..cf3fc582a1d1e7fa8aefb8a62e7488477ade3dbf 100644 (file)
--- a/mjo-listing.tex
+++ b/mjo-listing.tex
@@ -14,8 +14,13 @@
 \def\havemjolisting{1}
 
 
-\usepackage{listings}
-\usepackage{tcolorbox}
+\ifx\lstset\undefined
+  \usepackage{listings}
+\fi
+
+\ifx\tcbuselibrary\undefined
+  \usepackage{tcolorbox}
+\fi
 
 % Tell tcolorbox to use ``listings'' within the boxes.
 \tcbuselibrary{listings}