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-rw-r--r--Build/source/libs/libpng/ac/libpng.ac6
1 files changed, 5 insertions, 1 deletions
diff --git a/Build/source/libs/libpng/ac/libpng.ac b/Build/source/libs/libpng/ac/libpng.ac
index 009eb29cd33..fcf51aadf7c 100644
--- a/Build/source/libs/libpng/ac/libpng.ac
+++ b/Build/source/libs/libpng/ac/libpng.ac
@@ -1,3 +1,7 @@
-## libs/libpng/ac/libpng.ac
+## libs/libpng/ac/libpng.ac: configure.ac fragment for the TeX Live subdirectory libs/libpng/
+dnl
+dnl Copyright (C) 2009 Peter Breitenlohner <tex-live@tug.org>
+dnl You may freely use, modify and/or distribute this file.
+dnl
## define required functions and headers from system libpng
KPSE_CHECK_LIB([libpng], [png_set_read_fn], [png.h])